just had a new buddy seat fitted, out of a viking camper. Its the fold up type one. Anyway, I want to put a loo underneath it, but struggling to find one small enough. I have found the fiamma 30 bipot.

The height i have is just 30 cm, so its touch n go whether this would fit or not, and ideally it would be a couple of cm less in length or it will stick out underneath. I have heard that people have had loos under these seats, so just wondered if anyone knew of a smaller one, or indeed they knew which one would fit?
Thanks for any help,
kathy