i have a 1995 GS Friendship, 40' diesel pusher, on a spartan chassis. My wipers operate on individual switches (left and right). I've not replaced those specifically but i have done others. I've slid the switch out, or looked at it from the back, got a number from the switch, and then searched for it on the web. I've bought 2-3 switches this way and it's worked for me. May be worth a try. The numbers are usually printed on the switch, behind the panel.