Running board to bracket special bolt replacement?

[A_mod_too_far]

Looking for a replacement bolt for one i accidentally broke like an idiot. It is the bolt that connects the running board to the bracket. It is an m6 bolt 20mm long with a t shape head that slides in the channel, i guess these are called slide bolts or t slot bolts. The head is 3mm thick, 10mm wide, and 19mm long. I couldnt easily find a mopar replacement, even though if it exists I'm sure they want $20 for it. And I'm sure most people could easily fabricate something. I was hoping for something I could get at the hardware store or mopar worst case. Anyone know the part number?

 

[hunterdan]

This is what I found, not cheap at all, and not quite what you're looking for.

 

[Daw14]

Grind the head thinner on a bolt from the hardware store.