BlackStar 60BS58 1 1/2 K2S - 60 Pitch Finished Bore Sprocket - 58 Tooth - 1-1/2" Bore Super HC Molded Notch PowerBand The 19/B240 has a 21/32"

The 19/B240 has a 21/32" width

"sku":"TB072053088274"

"mpn":"TB072053691146"

so a 1224-8M-20 from any major manufacturer shares the same dimensions and runs on the same pulleys/sheaves

Dayco 3/D390

BlackStar 60BS58 1 1/2 K2S - 60 Pitch Finished Bore Sprocket - 58 Tooth - 1-1/2" Bore Super HC Molded Notch PowerBand The 19/B240 has a 21/32"The BlackStar 60BS58 1 1 2 K2S is a 60 pitch Finished Bore roller chain sprocket with 58 teeth, precision manufactured from SAE 1045 steel and features machine cut tooth profiles for smooth, reliable chain engagement. This sprocket has a 1 1 2" bore with keyway and set screws and is ready for immediate installation. Specifications Part Number 60BS58 1 1 2 K2S Chain Pitch 60 Number of Teeth 58 Bore Size 1 1 2" Minimum Bore 1 3 8" Maximum Bore 2 7 16"