Those are the high compression pistons.
Very hard to find.
I'm not an expert but I suspect that those have to be used with a head that will fit the bump.
I have similar pistons made by Paul Burke and they can only be used with the head that has the designation B35.
That doesn't mean just a head from a 3.5 motor but a head from like a 92 735 as an example.
yes i will check dimensions and tell you , just to avoid misunderstanding like for wheels !:: pistons are also in ebay and can be sold any time don't argue me later ! ,, tnx
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