stock bearing plate for a remington 870 wingmaster

[medvedqc]

hello.

while trying to mount a stock for a shotgun received in parts i did not find that plate but was wondering if any can tell me where to find it?

this is the 59 of this chart:

ht t p s://store.gravelagency.com/en/replacement-parts-oem/remington/shotguns/model-870.html

thanks a lot.

Phil