This is what the Plymouth Master Parts List says. For '28Q and '29U they share the same part numbers and descriptions for wire wheels. They all have "(with side ring)" (?) beside them. Then the next lines are for '30 30U wire wheels and ,besides the description, it says "(has 5 holes)" for 9 part numbers listed. They offered the wheels in 'prime' and 'enamel' etc. That's why so many part numbers for the same wheel. Then ,still in '30U, it gives more wire wheels with "(has 6 holes)". Then it leaves '30U and moves on to PAs. It appears these may be '30Us and not fit '29s?