So the shock stroke is about 1/2" shorter than the OEM 0106-173 however despite this there was JUST enough length to re-assemble the underframe into the sled body of my '74 Panther. I didnt have to angle the bolts or anything either - it alligned perfectly, but any shorter and I would have had to return the item. the old 0106-173 cylinder has a little more wiggle room when reinstalled the frame due to the extra 1/2" of stroke.