the replica Bakelite items you mention are probably the ones made by History Arms in the US.
Excellent parts, I have bought from them in the past.
Unfortunately, however, all my recent, several enquiries with them have gone unanswered. It's possible they're no longer trading.
So far I've been unable to source another supplier.
Hobby collector of Replica model guns and Militaria.
also member of Living History Reenactment Groups.