WTB: Overcoat straps for Federal knapsack

[CAlt]

I'm in the market for a pair of correct (i.e. MBS, Dell's Leather Works, etc.) overcoat/blanket straps for a Federal double bag knapsack. Does anyone happen to have an extra pair laying around that they'd be willing to part with?

I know that these are easy enough to come by new, but the cheapskate in me feels the need to check used before buying new.

Thanks so much for the consideration!