MJ's 71 Beaver (Dart)

A56 said
Fender Tag Option Code S31 is 70-71 only for front sway bar. I would think maybe it's part of a towing package, or suspension upgrade. or someone added it later on. I see you have power disk brakes which may have been part of this upgrade. Check your fender tag and or build sheet if available.

:thankyou:
No S31 code on the fender tag, nor on the build sheet.
But the number 39 in the "FT S/BAR" build sheet box (fourth line)

Front sway bar 39.jpg