The bolt that is attached to the top of the SumoSprings Rebel Custom Helper Springs - 2 Piece # SSF-173-40-2 is a 3/8" x 3/4" flange bolt.
This bolt is not offered as a separate part but you could easily go down to your local hardware store and pick up this bolt or if you buy the SumoSprings Rebel Custom Helper Springs - 2 Piece # SSF-173-40-2 which is a confirmed for your 2019 Tiffin Allegro Open Road Motorhome, it'll come with the kit.
these springs have a maximum weight capacity of... view full answer...