I found some other versions but they didnt fit, screw holes were too far apart etc. So I modeled this myself from the broken part.
Use a triangle 2.7 bit to loosen the guard rail sides and you can squeeze the bridge off the pegs, then use the same bit to remove the plastic part from the wood.
Prints in 16 min at standard speed
Print for strength
4 walls
100% infill
PLA
Supports On