I've been having the same problem. I got this JDM ITR 5 lug conversion and drive shaft won't fit right.
I've read you guys posting and wanna add something.
I bought 5 lug hub, and bearing from Acura. I pressed out the hub/bearing from my JDM and found the ACURA bearing was too small, yes the knuckle is different, too.
So, I did some research and found that Civic and Integra shares a same suspension, knuckle, so I press out my civic hub/bearing unit...
Guess what... Acura bearing is too big, the myth about civic/integra was wrong...
I just ordered knuckles from Acura and waiting for them to be arrive. Hope it'll go well this time. Cost me over $500 for only two knuckles (already spent $300 on hub/bearing).
It's going to be an expensive conversion but hope it'll worth it!
I'll let you know how it goes.