703 remote control

I have an Alumaweld with a 703 side remote control box. The nylon washers inside are cracking or broken. Can I buy replacement parts for this box? And if so, where can I find them? I'm coming up empty on parts when I Google for them. Thanks,
Scott

[boats.net]

The parts list for 703 control is at http://www.boats.net/parts/search/Ya...USH/parts.html