Fork Seals. Replacing fork seals is part of riding motorcycles, but the Pro-X fork seals offer a less expensive option than stock, but with no less quality or performance. ProX Frontfork Oil seals are made at the O.E. manufacturers in Japan. For almost every Motocross / Enduro application you can find the right Frontfork Seal at ProX. The high quality and competitive pricing made them a very popular item in their range. The way to go! Pro-X makes their fork seals with the same NOK material as O.E.M., so you can be sure that these fork seals are built to handle the abuse of motocross racing. Sold as a pair.