If you are certain about the 4 in the ones column and you can see it is 7 on the backside, the 4 on the backside would put a 1 on the front in the tens column. If you are certain about the 7 on the front, it would put a 0 on the backside. I think that does look like the bottom of a 0 on the backside. So 7xx14.x There might be some kind of key or marking on the wheels that give a clue to the number registration. I recently replaced the numbers on my speedo, and I wish I took more time because the numbers are not lined up perfectly.