My 75 Duster shows 45 TX9. I had 4.5" wide steels So just guessing that is the width and yours came with 5.5" wide. Maybe someone can confirm?I'm trying to find out what wheels came on my 74 Duster. I checked the Broadcast Sheet and the codes are 55 and TX9. I know Tx9 stands for black, but can't find what 55 is. Anybody know.