The ERA share the same offset as the CCX cars, and are .30" off an SPF, which could probably be milled.
ET Mags over in Leandro (30min from you) can mill and also re-drill them for a 5 X pindrive setup.
1965 West 140
San Leandro, CA 94577
Shop (510) 895-8880
Cell (510) 895-8152
Fax (510) 895-8102
sales@etmags.com
It may be worthwhile to run them over to see the feasibility. The Re-drill runs $80 per wheel. Also they may know of someone in the market for yours as they make a lot of Cobra and Vintage styles.
Last item: You may be interested in the
new set of wheels in the For Sale section of this site that are CSX fitment, 17X8.5 and 17x11 for $800.00
http://www.clubcobra.com/classifieds...uct=7551&cat=4