Gs700es part number needed for forks

[PR700es]

my forks are leaking oil from this rubber seal under the air valve. anyone know what the part number is and where i can get replacements for this?

[bwringer]

If you look at the fiche for the forks (I randomly chose 1985 -- make sure you look up parts by the actual year of your bike), you'll see there's an o-ring (#17 on the fiche) that's part of the fork cap.
http://www.onlinecycleparts.com/oemp...2/front-damper

If you look at the diagram for the steering stem, you'll also find the o-rings inside the air fittings (#19 and #26 on the diagram).
http://www.onlinecycleparts.com/oemp...-stem-gs700esf

There's also a "cushion", which is #17 on the diagram and appears to be the part you've circled, but it's not a seal -- the seal is formed by the o-rings.