Torsion bars fit all 911/912/930 through '89. Front bars fit all 914.
'87 and later 911 and '89 930 use a different style rear bar. Be sure to select the proper year when ordering 911 rear bars.
Sizes listed are solid-bar equivalent spring rates to facilitate comparison. Actual hollow torsion bars will measure approximately .5mm larger than listed.
Dedicated track cars often run stiffer bars that most would find unacceptable for street use.