Selles et Bagagerie

Within the same model family and era, often yes — Softail seats within Softail, Touring within Touring. Across families, the subframe width and rear strut pad positions differ enough to make a cross-family swap a fabrication project rather than a bolt-on. Check the mounting pattern and the seat-to-fender junction line before buying; photos don't always show the mismatch clearly.

Yes. The 4.5-gallon tank is longer, which pushes the rear seat mount back. A peanut-spec seat sits too far forward on the larger tank and leaves a visible gap at the tank-to-seat joint. Seat manufacturers that list Sportster compatibility usually spec by tank size — double-check before buying, especially on 883 models that shipped with the peanut as standard.

The fix is a pair of seat relocation brackets that shift the rear mount rearward to match the longer tank nose. Drag Specialties and Harley's own parts catalogue both list them by model year. Measure the gap before ordering — a 25 mm offset adapter covers most applications, but there are year-to-year variations that catch people out.

No — not as a straight bolt-on. Street Glide seats are built for the wider touring subframe; the Slim's subframe is narrower and the rear section won't marry the fender correctly. Cross-family seat swaps do get done, but they involve fabrication, not just different hardware.