Ola,

I would guess that 2808142 is a lower level part number to the assembly 3417412.

The Bill Of Material for 3417412 might look like this:

3417412 Barracuda Tail Panel Assembly
2808142 Panel
280xxxx License Plate Bucket
0999xxx Square Weld Nuts (2)
1111xxx Sealant

I have an NOS Challenger panel and I'll check it for a similair number but I'll guess that it does not have one since there no additional items needed to make the part.

M