For reference, I almost bit, but no tuners was a bit of a deal breaker: http://cgi.ebay.com/ws/eBayISAPI.dll...E:B:EF:US:1123 http://cgi.ebay.com/ws/eBayISAPI.dll...E:B:EF:US:1123
Dobe, If you don't mind swapping in non-authentic parts, other tuners are available. In my Martin restoration we used tuners from an old 12 string guitar and cut off one of the machines.
There's a Martin T17 Tiple with all it's parts (allegedly 1935) up for auction also: http://cgi.ebay.com/MARTIN-T17-TIPLE...item4aa9372ddf Current bid's $1000 -- pocket change next to this one, though: http://cgi.ebay.com/JOHN-DANGELICO-G...item3a4d354b23