t5 identification

i think i just got screwed on ebay. bought a t5 that came out of a 92. the input shaft is smaller than that of the old tranny i pulled from my 87 gt. i checked out some sites. i looked at some websites and i'm sure its a world class according to some number marks. did they make world class trannys for 4 cylinder mustangs? the identification tag isn't there. ofcoarse those numbers/letters didn't do any good when i tried to look them up on my 87 tranny. any suggestions?
 
The input shaft on 4 cylinder T5's is different from the 8 cylinder T5. It mikes out at .590", where the 8 cylinder is .668".

The first gear is different too. Put the trans in 1st, and turn the input shaft. If you turn it almost 4 turns, to get 1 turn on the output, it is a 4 cylinder trans. If you get 3 1/4 turns or less to get 1 turn on the output shaft, it is a 8 cylinder trans.
 
The 94 up input shafts are longer and 87-93 four cylinders have a slightly different input shaft than the v8. you probably have a 4 cylinder out a 92. All the markings on the case are the same and start out with something like 1352........