Quote:
as simple as I can put it
That's the problem,you need to put it a little less simple. You may be able to deciper what you meant,but judging by the replies you initially got,obviously no one realized that you were looking for stock replacement parts either!
Like mentioned before the 2gen ('95-up)style manifolds are the next closest replacement to the '90-'94 1g style/original part. It has a 6cm collector opening to match the stock 14b exhaust housing (The EVO III is otherwise similar but with 7cm matching a 16g). You still can get the them from Mitustishi through JNZ if having factory parts matters. IIRC,the heat shield is different between them and the '90-94 versions.
The cast those manifolds are made of seems to grind easily. If you were to source one used or new cheap,or just want to upgrade (they don't crack as easily),I wouldn't let that be a deal breaker.
The only replacement intake manifold without not requiring any modification to work as it's intended is the stock manifold,turbo or non turbo. I'm not aware of anything that would go wrong with it to need replacement,and even if you decide to mod the car later guys have gone 10's with them at least so it should be good for a while.