This Seeburg Cash Reinforcing Channel # 406095 is found on the inside face of all metal cash doors in Seeburg models
HF100G, 100W, HF100R, 100J, 100JL, V200, VL200, K200, L100, 101, 161, 201, 220, 222, Q100, Q160, AQ100, AQ160, AY100, AY160, DS100, DS160, LPC1, LPC480, U100, PFEA1U, APFEA1, SS160, LS1, LS2 and LS3.

It mounts with two 1/4-20 machine screws (not included, but if you ask by a note at payment I will try and find some).