Vector/Coharie .40 Cal. MP-5 Clone Parts?

[CAL.BAR]

Hello all. I have a Vector/Coharie MP-5 clone and one of the two bullet feed guides that plug into the receiver behind the trunion keeps falling out. I had my gunsmith try to weld it in place from the outside (with marginal success - it fell out again).

Does anyone have an extra original piece (or know where to get one)
They look like THIS:

[JDW67]

this is where I get my parts from:

http://www.robertrtg.com/store/pc/Barrel-and-Trunion-c125.htm