with the rx7's we use a couple of pumps that are external like the mb, either should work, with a little creativity on the mounting (different diameter can)

1st one is a pump from the 84-85 rx7 gsl-se, its the 1.3 liter fuel injected engine, runs about 40psi in the stock car, and will handle about 200hp. mazda part number is N304-13-350C, its available aftermarket for around $80

#2 is the pump out of any 80's cis (audi/vw) car, goes right into the 84-85 rx7's, and it will supply a tad more fuel. these are all gone from the junkyards, so they must go bad

#3 is the external pump from a 930 porsche, its the same from 79ish to now, they cost around $300new give you enough fuel for 400hp

mike