i replaced our old Aqua Magic plastic toilet a couple months ago and went with the Dometic 311 low profile(same as 310 only bone color).I bought a 1/4" riser from the hardware store, turned it to the 3 and 9 o'clock position, siliconed and then screwed to down. Waited until the next day to set the toilet and all is fine. The gasket will compress a little more than usual but still seals. I know one person that heated up a spare toilet bolt enough to push the bolt through the flange around to the correct position. It's doable either way, the other mentioned toilets are fine but not for the budget minded IMO