C2 Cassette Toilets

There was a thread on here a couple of weeks ago from someone having a problem in identifying their toilet.

Well mine is a C2 but as i've recently found out there are two different lipseals (the rubber seal).....both for C2 cassettes, but different sizes. The only way to get a precise id is from the label stuck on the underside which gives a code. And it's that which will tell a supplier if your toilet is pre June 2000 or after. Pity Thetford didn't simply year date them instead of using a nonsense code of numbers.