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[@AMBUMAN121]

Glad to see you are going back with the steel rims and correct wheel covers. I remember putting a Twin-Sonic on a 1972 C/B Olds hightop and having to fabricate the mounting points, although I used the gutter mount brackets supplied by Federal and it worked out well. I had purchased the Twin-Sonic myself, so when I left that service I took it with me because the owners were too cheap to buy it from me. I think I paid $350 for it in 1973.