It's GM 3848495 not that I'm expecting NOS, because used is good so long as acid and rust hasn't eaten it away.

My original 7-5/8" bolt is too short because a Legendary Topper adds height and it turns out the hold down I rewelded wider to clamp it is the short drop heavy duty battery type.

Using redi-rod with a couple of nuts on the top which is not a good look compared to the rest of the setup, especially after I send the modified hold down out to be plasti-dipped.