I need a base (bottom housing) for my 1980s-era Kenmore canister vacuum cleaner. The model no. of the vacuum cleaner is 116.27312790, and the part no. of the base for that model is 4370315 (no. 21 on its parts diagram). All of the mechanical and electrical parts of my vacuum work fine, but the base is broken and the part is discontinued, and I'd like to just swap all the internal parts over into an unbroken base if I can find one.