Crank bolt to hold damper

I didn’t find one deeper than stock at ARP.
I only looked under the MoPar sections. Perhaps another brand has the same size but long? IDK, lots to go through there.

Mancini has some replacements, but their site is acting up on the site map page...

This is the only one that I can pull up at this time...

I would call them to ask if they have one longer....

https://www.manciniracing.com/en426sthecrb.html