I understand that the ‘72 2.5 S (M491 SR) has an enlarged oil tank (11 litres?) and have found these photos of it:

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but am not expecting to be able to find an original one anywhere. Accordingly I have bought a refurbished ‘72 S tank with a view to converting it in the same way as the factory would have done in period.

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Does anyone have any technical details such as dimensions, fittings (I am assuming M30?), internal baffles etc that they could share with me, or better still does anyone have one which they would be prepared to loan to me while we make an exact copy of it please?

Hope someone can help me with yet another aspect of this very challenging project!

Thanks.