Fits 175, 260, and 460 GPH VR Series Billet Fuel Filter and EFI Filter/Regulator. 50.3 mm I.D. Mounting Bracket Thru-Bolt Holes: c/l to c/l = 3.150" & use w/ 1/4" Mounting Bolts. The threaded mounting holes in the bracket are M6-1.0 Mounting Bolt Holes: c/l to c/l = 3.150" & use w/ 1/4" Mounting Bolts. Each Bracket is 1/2" thick by 3.750" Wide.