Were do I get parts for a wesco furnace model wcg at serial 11281 twenty five years old.

You probably will not be able to locate parts for the old Wesco. There has been many posts here and on other boards about this problem. I have searched all over for parts and none are available. They also used a special ribbon type heating element so the standard replacements available for other brands will not work either. If you ever find a place that has the parts please post the company and phone number because folks doing a Google search or other search will be glad to know they are available