Under the rear seat cushion on my Mk2 is a small piece of foam (around a foot square) sitting loosely in the middle of the seat platform. Is this all that would have been fitted originally?

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1970 Cooper S SPO41

Mine has 2 pieces of foam, one on each side. Foam is the same as it was 42 years ago when I bought this car.

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Clive G
1969 Mk II Cooper S
1970 MK II Cooper S
1963 Triumph Spitfire
1982 RX-7 Series 2

The foam is attached to the seat? Anything sitting on the metal platform below the seat cushion? That's where I have the small piece of foam

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1970 Cooper S SPO41

The foam, 10" x 11" (inches), is attached to the seat base, but I have 2 other bases, 1970 vintage acquired 2 years ago, one has the foam attached and one doesn't. No foam attached to the metal platform.

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Clive G
1969 Mk II Cooper S
1970 MK II Cooper S
1963 Triumph Spitfire
1982 RX-7 Series 2

Thanks CGO. So looks like there is not supposed to be any foam on the platform, just under the seat itself. Like your collection of classic cars by the way. I have just the one - a 1970 Cooper S as well, an SPO41. Crystal white as yours seems to be.

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1970 Cooper S SPO41

Yep it's Crystal White, I did change its colour though in the 1980s, but it is now back to its birth colour.
http://users.tpg.com.au/hcgordon/minidiary.htm
It has been a great servant, owned it for 2/3 of my life, that's scary.

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Clive G
1969 Mk II Cooper S
1970 MK II Cooper S
1963 Triumph Spitfire
1982 RX-7 Series 2