Why not just find some old American or Western aluminum slots at the swap meets and have them polished. I have a set of 7x15 (5 on 5) and a set of 8.5 x 15 (6 on ? for my '67). They are usually pretty reasonable at the swap meets.
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'68 C20 Longhorn 50th Anniversary 400/TH400
'68 C20 Longhorn 50th Anniversary 468/TH400w/buckets
'72 C20 Halfhorn (Longhorn w/o cab and front clip)
'69 Flxible Cruiser (look up ugly in the dictionary)
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