alright, dont quote me on this since i have never done it myself BUT, i was similarly trying to use a 90 t-5 for my 94, i couldnt find a rebuilt 94 for the right price around here, so i was gonna take my buddy's 90 t-5 and replace both the input shaft, t/o bearing retainer, and input shaft bearing with the 5/8" longer input shaft so i could use the stock 94 bellhousing and clutch fork from a 94. the only things you really need to watch out for ( as far as i know) is that the gearset is the same and similarly the tooth count of 4th gear is the same which would mean that the counter-shaft is similar and would therefore work. however this is if you are trying to replace the input shaft to make it work. if you are just trying to use the 5/8" longer 94 t-5, it may or may not work. information that i got from www.bieberfever.com was that if i was to buy a t-5 from them, it would be the fox style with the shorter shaft and i would be able to bolt it right up to my 94 with using the fox bell and clutch fork regardless of the difference in length when it comes to my driveshaft..which means its possible that the difference in length is so minute that it wont matter. however, i dont know if this is true, or if the guy was just trying to make a sale because i have heard countless bad things about them. one thing that he did warn me about though, is never to use a spacer, or to modify a driveshaft, the balance and angle at which it meets the output of the transmission, and the rearend could be seriously damaged and could otherwise cause a bad vibration. Yet again, it is possible that things would bolt right up, i just dont want to give you false hope about something that has so many avriables. One guy that I have been talking to is 5spd GT since he has done exatly what you want to do, however by replacing the input shaft from a 90 into a t-5 from a 95. this would probably be your best bet to avoid problems down the road. good luck, give 5spd gt a PM if you have questions, or give me a PM if you want, i work a lot, but ill try to answer your questions as quickly as i can.