Tubular A arms slightly too wide!

Got some tubular A arms off a guy who was parting out his 68 cuda, which were still new in the box. I believe they are cpp. Anyways went to install them along with my disc brakes and they are about 1/4 inch too wide! There is really no play to squeeze them together. What do I do? New bushings possibly?

Plymouth dusters a-body is wider, than early body.
Any part number on the box..

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