Ok so left to right here are an asortment of pins we tried for removable Kick doors.
1/4 " cotterless hitch pin. too small but the prefect pin if you can find one in 5/16"
3/8" cotterless hitch pin. I thunk I could take out the bushings in the hinge and try this pin but no go. get one that is 5/16"
5/16 uiniversal clevis pin with a spring hitch pin to keep it in place. Thins will work but is hard to get in and out due to the lack of a grab ring. also the top one has to go from the bottom up due to clearance. This is why the spring pin.
5/16" spring clip pin. Again a great pin easy as any of them to get in and out but the spring clip gets in the way of the door if you install it from the outside, or the rubber seal if you install it from the inside, which is easier anyway. It could be modified with a BFH to clear but the cotterless hitch is prefect. Im' looking for a bulk supplier now.
Hope this helps
Wayne