1974 Scamp some assembly required

Finally! Someone with a good idea for a center cap! Where have you been, LOL?

Do you remember what size so I don't have to roll a wheel in there? Thanks!!!!!!
Lol! Well I can’t take credit for the idea, I’m stealing it from another member. I believe the cap is the bigger of the two post sizes. I’ll measure one of my caps this evening and let you know for sure on the size.