I need a lid gasket, for the windshield washer reservoir. I checked Rock Auto, and Advance Auto Parts with no listing at all. Right now, I have it held on with a bungie cord. Any ideas where a can check next?
Ed

 

Not sure about 75 , but my 78 was sealed on,with no gasket . I had to re glue it years ago as it was loose . Hopefully someone else will chime in .

 

My '77 also is, was "glued" on years and years ago .... but age and heat and etc killed the glue. A couple years ago I decided to repair it as lid was loose and pump shot. Cleaned it all up, new pump inserted, and instead of gluing .... I cleaned the groove in top that originally was filled with glue, and fdound it would snap over lip ofbottom. I used six small zip ties, drilled mating holes in each end and along sides just big enough to allow me to use the zip ties to fasten together. Then I snapped it together and zip tied it. Works great!

The cap just snaps shut.

 

I just used some silicone I had.

 

Thanks for the input.
I did find that LMC Truck has the reservoir listed, but it is complete with lid. Not as separate parts. Since my reservoir tank is OK, and I just installed a new pump and cleaned the dirt out of the reservoir tank, I was thinking of filling the groove in the lid with silicone (RTV), pressing it down on the reservoir, and holding it in place until it sets.
Ed

 

That worked for me.

 

I had the same problem with one of mine before. It was a perfect time to clean it out inside. I glued the lid back on with clear 3M glue. Never had a problem since.