273?

O.K. Thats what I was thinking. After reading the post from chryslerfat. So with that being said I did go on ebay and see there are a few for sale. Now I see there are 2 different sizes(not sure if either is what I need). One is for a 11 x 2 1/2 and the other is a for 10 x 2 1/2. All three look different so how do I know the correct parts I would need? Thanks