4.785 Final Drive!

Hey!
Ive got a CRX b16a running a J1 box! Ive also got an LSD and 4.7 final drive from an ITR! What would be the best way to get the final drive to fit?? It looks like i have two options:

1. Get pre 98 spec ITR 2-5 gears or
2. Get a Y21 box!

Is there something im missing?? Which one would be better or is there an easier way that i dont know about??

Any help/info is great!

Also does anyone have any sites where i might be able to look deeper in to this??

Thanks!

You don't have to change the gears just the counter shaft. Also why do you want the 4.7? You have a 4.4 already and I am sure your highway driving is uncomfortable as it is. The 4.7 will only make it worse.