Marker Light Replacement Lens

[Fivecodys]

Hi guys,
I lost a marker light lens and I am having a devil of a time finding a replacement.
I have tried the usual sources like e-trailer & amazon but I am striking out.

Apparently Reflection models have an odd ball size.
The actual size is 1-3/4" x 4-1/2"



Any suggestions on where else to look?

Thanks in advance for your comments.