Which Airhawk cushion fits the 20+ RTL best? or did I miss the CanAm seat cushions on the Airhawk website? Based on the Butt Buffer size chart for Can Am (17.5" x 14") I would guess that a Large Airhawk Cruiser R Large (14” L X 14.5” W) would be best for Spyders.
Airhawk https://airhawk.net/product-category/seat-cushions/
Butt Buffer https://buttbuffer.com/benefits/fit-...torcycle-seat/