Tranny Question

I have a a1 ls tranny.. i want to know what year it is because i am wanting to buy a new clutch for it...thanks for the help!!

b18a1's are 90-93

I belive the thickness of the Imputshaft, the 90-91 should be 1" and 92-93 should be 1 1/4"... I will verify this when I get home.