Please note the following:
T1 Forks are for a 2" Diameter lid
T2 Forks are for a 2 3/8" Diameter Lid
T4 Forks are for a 3" Diameter Lid
Float forks are not interchangeable between earlier & later types. To find out if you require an earlier or later type float fork you need to measure the distance between the face of the lid to the hole for the Fork Pin.
Early Type = 1/4" Later Type = 3/8"