There's item # 266738062828 on eBay, which is just the mast including the stud. I'm not sure how much more you might need. Not cheap, but apparently correct (it's been so many years since my '63 had her original mast I wouldn't know from personal experience; I've had a power antenna on mine for many years).
HTH
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Lewis
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Lewis Rosenthal
'63 Bonneville Convertible
'56 Safari
'82 Firebird SE
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