I have seen the "chassis" out riggers for sale once in a while over here in Holland. I assume the Duett has the same bits as the PV
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I have a PV544 from 1961.
It has a B20 engine fitted (I bought it that way)
I have no idea if the original 1961 cross member is still fitted - but I assume it is. My car originally had a B18.
I have put loads of pictures in a thread on this forum which is linked in my sig below. There might be enough information in there for you to see for yourself. I can also take a few pictures if you really need of the cross member as the engine is still not fitted in the car.
My understanding is that from a "will it fit" situation there is no difference between the B18 and B20. I think it is an easy swap / upgrade / change
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