Outer Limits 4x4 Board

Toyota no longer has any of these available and I cant find anything aftermarket. Old seal is still intact but would like to replace it with a new one if possible. Anyone got a suggestion? Ruff, what are you using when the rear window goes back in?

Mine isnt extra cab but the old rubber is perfect. Some of the aftermarket Panel supply shops can get new aftermarket rubbers but not sure on the quality.