I have a simple white Portland Maine toilet that would match your typical claw foot tub and 2 faucet sink from the early 1900's. The potty uses all standard parts and was working when I replaced it with an extended bowl. I had put a gallon jug of water in the tank to save water. The offset is 2 inches farther out than standard, but there is some room for adjustment by replacing the goose neck with a different piece.
Call Lyn at 207-604-0335