Cassette toilet C3 or C2?

Just got my 'new' Trophy home. The cassette toilet has been removed and a porta potti put in there (which I knew about before buying it.) Having looked for a C3 on ebay etc., all I can see are C2 models, would that fit in the same space? Is it just that the flush is from a different tank? Or any idea where I could get a C3 from please?
Sorry for all the questions, any help greatly appreciated.

Hi from Cornwall, youll find everything you need from CAK Tanks ,they've a online catalogue and ive always found them most helpful on the phone. Good luck with your new M/H .  Regards                         Paul

Hi Paul.
I thought that my 1996 Harmony was fitted with a C2 until I came to use it for the first time - I couldn't locate the flush water filler tube. I then realised that my van was fitted with the C3L. The difference between the two models is that the C2 has a fillable flush tank where as the C3L flush is supplied by the on-board water tank and pump.
As far as I know, don't quote me, both models occupy the same space.
Regards Grahame

Hi my Trophy has the C3 cassette toilet flushed from main water tank
mike
vwt4

Hello all. My trophy has a fiamma toilet. Trust me to buy the awkward one lol.