To answer your question, you could search Porsche salvage yards till you find a car with that harness. Then remove it. The catch is that a 40 year old harness is going to be in rough condition. Kroon makes a very nice product, as original as I have ever seen. $200 might sound like a lot for that piece, but it took a fair amount of time to make it. Everything in this sport has become a lot more expensive in the last 5-10 years.