Get a black cover and paint it. When I had a Brown seat on my 79 and went black with the body work I painted the brown seat black. I used SEM Marine Vinyl Coat..... worked well and 10 years and 40K miles later looked brand new even with my 250lb butt setting on it. Going Black was easy,
hopefully they will have a shade of Brown that will match.
Joe,
Thanks for the simple solution and waking me up to see something I already knew.
This will work and it will work well. About 5 years ago I attached a Ural sidecar to my R90/6. The rusty old tub needed a lot of patches welded in and there was no seat. A good friend was doing the work for me and I had bought a $40
BLUE boat seat to use as a temporary solution until I could find a Ural seat. When he made the mounting brackets he also spray painted the seat black. It has held up extremely well and I should have remembered the solution but luckily we have this forum to remind us of the things we used to know.
Thanks again Joe.
Brett