hi! recently ruined my gearbox on my 95 sti 555 and am on the hunt for a new box,seen loads for sale on ebay etc but i'm not sure which will fit?

the code i have is 6GTY 752 VB4AA and its a very close ratio box,does 80 mph at 4k in 5th which made me think it was an RA box but the code is different,any ideas guys?

thanks