Scrub that last request !!!
Seems I have the “big” intake manifolds – and now I’ve checked I find they are spot on to use as a base for the intake from the blower. Two tubes will come off the intakes to a circular [ oval if I can find the material ] plenum which will then shoot off with two curved tubes to the blower outlet.
I have now discovered an even more compact [ externally ] Eaton, with the same capacity. Checking that out now – if that works, that’ll leave me 2 to sell off !