Found a source for the replacement cage nuts as used on CMPs. Of several found MAC's Antique Auto Parts had the best price.
www.macsautoparts.com
1/4-20 Cage Nuts $0.60 per
5/16-24 Cage Nuts $0.95 per
3/8-24 Cage Nuts $1.60 per
1/2-13 Cage Nuts $1.65 per
I ordered the nuts I needed on 2/24/05 and received the parts on 3/2/05
MAC's also has a wide selection of Ford parts which might be of use