I use trial-and-error, testing at the parts store various filter cartridges with the canister.

Post the dimensions of the canister and maybe people will tell you if it matches their canister (and the number for cartridge they use).

1. Outer diameter of the top of the canister =
2. Length of the straight side of the canister cylinder (from top to start of taper) =
3. Approximate length of the canister's taper/"funnel" =

If people posted the cartidge number they use with different dimension canisters, this information would most likely be helpful to a lot of people.

I will post the approximate dimensions of my AC Delco S-6 canister (P-115 AC Delco filter; 1100 NAPA filter) on Wednesday.

Tim