I do know that in times past Numerich Arms/Gunparts offered replacement wood for the No.5 fabricated from No.4 wood. Don't know if Numerich fabricated these in-house or sourced from elsewhere.
As rough as some of the Century imported carbines were...I wouldn't be surprised if Century Arms may have retro-fitted some parts metal or wood.
A friend of mine bought one and the butt-plate rubber was amazingly rotted as were the butt-plate parts(rusted to the degree the sling loop fell off!). Wood was more or less intact. I found and bought a complete set of original No.5 wood with butt-plate on e-bay and we used the butt-plate parts to 'fix' his carbine.
Just saying that parts get replaced on Enfields...even in Oklahoma!