Shock Absorber - Oil Filled - Early VWs
Karmann Ghia 1956-65
The shock length fully extended, is roughly 15.25" and 10" collapsed, eyelet to eyelet.
The eyelets at the upper and lower ends of the shock have a 12mm (just under 1/2") inner diameter sleeve.
The mount on the trailing arm should measure about 11.9mm (just over 7/16").If the hole is "too small" to fit on the lower mount, then the old shock sleeve has rusted in place and must be removed.
Sometimes a pair of vice grips is all it takes, sometimes heat, a chisel or even a cut-off wheel have been needed.