[Mr70]

BillD
The Parts Place has it's critics,good & bad.
They sell many parts for many Vehicles.
That particular reproduced Water Pump #3906656 pulley is specifically for:
*1965-68 Passenger & Chevelle w/Spcl. Hi-Perf 396 & 427 CID.
*1966-67 Corvette 427 W/O Air Conditioning.
*1967 Camaro 396 w/A.I.R.
*1968 Camaro & Nova w/Spcl Hi-Perf 396.

Hotrodpaul
#3858533 BJ is a Crankshaft pulley for:
*1959-60 Pass w/H.L cam Hi perf,Spcl Hi-perf 348.
*1961 Passenger w/Spcl. Hi-perf 348.
*1961-65 409 w/o Air Conditioning.
*1962 Series 10 -30 truck w/62 AMP Gen.
*1962-65 Corvette w/Spcl. Hi-Perf Fuel Injection Exc 396.
*1963 4WD 283 1st series.
*1966-68 Corvette w/Spcl. Hi-perf 327.
*1969 Corvette w/Hi-Perf & Spcl. Hi-Perf 350 W/o Air Conditioning.
*1967 Camaro 302 W/O Power steering.
*1968 Camaro 302 all.

Crankshaft pulley #3921923 BM is a 2 groove for:
*1968 Passenger w/Spcl. Hi-perf 427 W/o Power steering.
*1968-69 Corvette W/Spcl.Hi-perf H.D.427 1st design.
*1968-69 Corvette W/Hi-perf. 427 W/o 3X2 Carbs.