Triumph Billet Aluminum Inspection Plug SET/3 57-2166 650 750 BSA Carburetor They're also suitable for just

They're also suitable for just about all Triumph 500/650 pre-unit machines

part number 82-3617

please be sure this is what you need (there are FOUR that Triumph/BSA used over the years)

Ducati part number 0795-37-063

Triumph Billet Aluminum Inspection Plug SET/3 57-2166 650 750 BSA Carburetor They're also suitable for justMagically lovely, and functionally identical to the original cast versions. CNC machined and polished, Triumph BSA's part number is 57 2166 or T2166. They should fit just about any vintage Triumph or BSA engine. Listing is for THREE PIECES, which is what you'd need for most UNIT Triumph 500 650, and pre 79 Triumph T140 750 apps.