904 Lock up

1985 Diplomat, 904 or whatever variant there of. Looking for a shift kit. Mancini says there isn’t one for the lockup. B&M says 10228, TransGo say TF-2 will work for LU or non LU.
I need a firm answer, Will a shift kit work in a 904 LU or no?
I’ve chased the threads to no avail.
BTW, the converter says it’s a lockup.
Step up tranny guys!

Thanks!!