I used to be one of those mopar or nocar guys, back in the day. Also had A 1978 ramcharger. The A-body cars had 5 on 4" lug pattern, until 1973 then they had 5 on 4.5" my ramcharger had 5 on 4.5" also. To measure lug pattern you skip one lug hole & measure center to center of two holes. in other words one hole between the two you are measuring