John,
Found it! Go to the "Registry" section of this site, then "Members" and find a file titled "CMC Manual". There is a page in there near the back explaining the conversion. It looks like this was an option from CMC but you might be able to fabricate yourself or check with one of the kit suppliers.
Here is the direct link to the page:
www.speedsterowners.com/files/download.asp?subfolder=/Members/CMC%20Manual/cmc997.jpg