Now that you mention it, I have seen those shouldered bolts before. They also are prone to wear out causing a lot of slop.
The '53 235 I am currently running does not have that shoulder bolts and nut arrangement.
Looking at breezy's pic, his bolt doesn't look right to me. It may well be, but he needs to check to see if it has a shoulder on it which fits properly in the sheet metal hole without a lot of slop.
