New Holland 788421 is the o-ring Clinton Tractor supplies for this application. It is listed as fitting 44 New Holland models.
What 788421 fits
Fits: Ford 3000-SERIES, Ford 3900, Ford 4000-SERIES, Ford 4100, Ford 4110 + 39 more. Commonly ordered for the Ford 3000-SERIES, Ford 3900, Ford 4000-SERIES. If your machine isn't listed, check the serial number before ordering.
Which numbers it replaces
788421 replaces 87129S94. If your parts manual or the old box shows any of those numbers, this is the correct current replacement — no fitment change.












