Tom,
For a more serious answer--
I think you will find that magnesium is darker than aluminum, but with
oxidation etc. of either one it may still be hard to tell. I bought 5 in
excellent condition for $800 and I think it was a great deal. There were 4
14 inch for an MGB at Carlisle for $750. They were in fair shape, though I
didn't look closely. I don't know anything about repairability but I guess
that if you have Ferraris and vintage racers anything is possible. I do
believe that magnesium cracks easily so you might be wary of "cometic dings
and blemishes" which may be the cause of a serious crack.
In addition to being dealer options they were the standard in SCCA in the 60's.
Allen Hess
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