Thread size of shift lever

[thatclappedsilverado]

Hey all, looking to find the thread size of the shift lever, trying to find a longer shifter arm for my truck and havent had luck yet. Its a 95 k1500 nv3500 and im not in a super great position to work on it right now. No garage and its been -4 almost every day for the last few days.

 

[Rafaz]

I think the base of the shifter thread is 5/8 FINE for my GMC sierra 98 and I cant
Find shifters to fit