I have a '99 M8580 with 3 sets of remotes. 2 sets are plumbed for the loader, and one is an actual remote. All 6 couplers are leaking. Can these couplers be rebuilt, or is this a replacement part? If so, is there an aftermarket coupler that will fit the factory mounts? The factory couplers are 150.00 a piece and are part number 35861-82034 Thanks in advance.