Shift knob thread size

[Bartelsgk]

I am looking at aftermarket shift knobs anybody know what size i need for an 87 fiero gt? M10,m12, etc.??

 

[92 Sunbird LE]

5 speed engraved shift knob: M16 x 1.50 for 1985-1988 Pontiac Fiero

Classic engraved shifter knob: 2 1/8" ROUND BALL of thermoset resin 5 speed shift pattern Engraved, paint-filled; plain sides - no logo M16 x 1.50 threaded brass mount Jam nut included; knob will break if mounted w/o nut! Made in USA by a Hurst supplier Fits 1983-2002 Camaro / Firebird &...

core-shifters.com

Doug in P.R.