Hi: Peter Crowl... A picture is worth a thousand words. The tank on our '77 was just a rectangle and was held up by a 2X2 wood frame, 4-6" bolts, and the fiberglass cutout from the front/back window of the Boler
. It wasn't a defined shape or fit between the frame rails. Sorry I don't have any pic's. from my tank rebuild as I didn't have a digi cam then.
The spin in fittings actually cut the threads in the tank holes when inserted.
No one ever hooked up the vent line properly so I imagined the tank was slow to fill. When I reinstalled the tank after replacing all the hoses I had to drill out the vent line blank in the fill cup for the new hose.
Our '77 was built in Earlton Ont. and as there were several different factories, and suppliers of components they are all Bolers...but different in some ways.
Alf S. North shore of Lake Erie