Info 911s homologation 71' + info option M471 for my71'

Hello,
having a conservative restoration underway on a 911 built in 1970 with homologation 1971, i came across a series of information that was difficult to find for this specific version.

I have read many texts by referenced authors that in this splendid digital space, the most expert of you often cite and some insights are necessary for me and i am here to ask some questions and ask for help to better understand the history of this model year.

What did the optional M471 package for the My71' include?

I know it's different for the My72' (although called the same, but included a different setup) and for the My70' it was just something else.
For the "homologation 71" version, i do not consider it comparable to the M470 deletion option, to lighten the vehicle's coverings, finishes and tank, ecc ecc ecc...
However, as i understand it, it was possible to keep both the M470 and order the M471 in addition, but without the option for uprated engines and specific gearboxes (combined with the cancellation of the M470, effectively to "create" S/T...).

Furthermore, in some texts, there is talk of an elusive Sport version (road version) built in this short period of time (construction 1970, 71' homologation) with rear bonnet and central rear bumper in aluminum (already standard?!), as well as interiors sports seats and rear seat extensions (for FIA group 4 approval).
Perhaps as a special set-up?! and i don't know what other accessories...

Were the Koni Sport for the 911S My71' standard or optional?
In some texts i found Boge written as standard, in others they mention Koni as standard.
But was there a Koni Sport (perhaps with even sportier settings, accessory only for S model) option superior to the Koni?

Can any of you experts help me delve deeper into this information and understand better?

Thank you very much !!

UP for Info !
Thanks ��

Do you have a copy of the book about this precise subject?

https://www.early911sregistry.org/fo...mp-seats/page3

Fantastic work, @mscott842 , by the way :cool:

Up - Up - Up

My understanding is that in 1970 the 911S was a stripper model; that is all the comfort equipment was stripped out to make the car as light weight as possible. Then if you wanted a regular touring model you got option M470 (for 911S) to put all the stripped out equipment back. The M470 for the 911T, and 911E were to bring those models up to the 911S with M470. The contents of M470 varied by model and by year as more equipment became standard.
1971 911S was an odd duck due to homologation efforts. The rear seat extensions were part of it. Also, this car was the only one I know of where the VIN series has a mid-year gap of over 200 units; that is, about 17% of the VIN range did not exist. No explanation for this to have happened.
The 1971 option M471 is not the same as for 1970, but becomes a major sports purpose alteration of the car. A lot is deleted, some is added, and some is modified. I myself have looked into this and still have not found a comprehensive list of changes. In this view, M470 with M471 was not a possibility. In fact there was no M470 for the 911S in 1971 since the standard build was not the stripper model of 1970.
The Koni shock was a standard equipment part with the 911S aluminum calipers from 1969 through 1973 on the 911S. There may have been special versions included in M471.

Thank you very much @Davep, excellent contribution and insight!

However, i am unable to understand and therefore know what the M471 option included in detail for the My71' version; can you at least write to me what you were able to find for sure about this option?

Furthermore, i ask you another question:

are you sure that for cars built in 1970 with a 1971 model year it was not possible to exclude the M470 (regardless of whether or not the M471 code was included) ?
Maybe only for the 1971 constructions on the 1971 model year it was not possible...
This would also coincide with the fact of the change of direction of the FIA ​​homologations, of some rear parts no longer being made of aluminum (standard) and of the modification of the standard sports interior and extension of the rear seat, with standard comfort seats again and rear seats without extensions.