B&W Biker Bar part # BWMC2303 is the correct version to use for all variants of the Harley-Davidson Sportster. It will fit on frame tube diameters from 1-1/4-inches to 1-3/8-inches and on frame widths from 4-1/2- to 7-inches.
Other versions of the Bike Bar are offered for touring bikes, part # BWMC2301, and for Dyna/V-Rod/Softail models # BWMC2302. view full answer...
With the frame of your 1974 Harley Davidson Sportster being 5-5/12 inches wide you will need the B&W Biker Bar # BWMC2303. This bar will fit on frame tube diameters from 1-1/4 inches to 1-3/8 inches and on frame widths from 4-1/2 to 7 inches. Drilling is required to bolt plate to the trailer floor.
If you have any other questions please feel free to reach back out to me anytime and I would be more than happy to further assist you. view full answer...