Ferris 7035813SM is the spring, torsion, side Clinton Tractor supplies for this application. It is listed as fitting 17 Ferris models.
What 7035813SM fits
This spring, torsion, side covers 17 Ferris models. Commonly ordered for the 2691384-00 - ZTX, 25 Gross HP B&S and 42" Mower Deck, 2691384-01 - ZTX, 25 Gross HP B&S and 42" Mower Deck, 2691385-00 - ZTX, 25 Gross HP B&S and 48" Mower Deck. If your machine isn't listed, check the serial number before ordering.
Which numbers it replaces
7035813SM replaces 7035813. If your parts manual or the old box shows any of those numbers, this is the correct current replacement — no fitment change.

