BlackStar N 2 7/8 - QD Bushing - 2 7/8" Bore Pitch-2080 32T10/780US is a timing belt

32T10/780US is a timing belt used on positive

The BlackStar H40BS23 1 1/8 K2S is a 40 pitch Finished Bore roller chain sprocket with 23 teeth

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so the 3/C138 interchanges with Gates 3/C138

BlackStar N 2 7/8 - QD Bushing - 2 7/8" Bore Pitch-2080 32T10/780US is a timing beltThe BlackStar N 2 7 8 is a N series qd bushing with a 2 7 8" finished bore, precision manufactured from high grade steel. QD (Quick Disconnect) bushings feature a split taper design that allows fast, easy installation and removal without disturbing other drive components. Specifications Part Number N 2 7 8 Bushing Type QD Series N Bore Size 2 7 8" Minimum Bore 1 1 2" Maximum Bore 5" Outside Diameter 7. 000" Length 8 1 8" Material Steel Approx. Weight