M-1109-A
5 x 4.5" bolt circle, 2.775" wheel pilot hub for popular Mustang size wheels Should be used with IRS knuckle M-5970-A Original equipment on 1999-2004 Mustang Cobra
M-1215-A
For use with kit car IRS hub M-1109-A Original equipment on 1993-98 Mark VIII, 1989-97 Thunderbird, and 1999-2004 Cobra
M-5970-A
Knuckles for use in kit car IRS systems Hub not included! Use with M-1109-A. Sold separately Includes M-1215-A Original equipment on 1989-97 Thunderbird and 1993-98 Mark VIII