mine is a 9" ford that's 54 1/2" also.my spring are too short (
oil pan 3 1/2" clearance) so i'm looking for 10" free length.dusty's springs look like 2 1/2" id all the way up into the mustang II cup.Unlike mine that have two different sized ends 2 1/2" and 3 1/2"at the top. With the streight springs , there are alot more choices of length and rate. the Camaro sway bar does look perfect . how to mount to the tubular A arms is the next question.