I had the 1100J which was the last of the slab sided GSXR's, in the 750's the "J" model was the first of the new shape. The J,K,L models were basically the same with small changes in the engine, {stroke i think} and the "l" was the first 750 model with the upside down forks, i had a mate who raced one and i rode it several times and thats the reason i know this model well. We were the same with the GSX and bandit, the USD forks came a lot later in those models..
Mick