So I know this has been asked before, but I can't seem to find the right answer for my Shopbot.

I am looking for the extrusion that is used for the X axis on a PRS. I have a standard that I upgraded to an Alpha.

From what I have seen it is supposed to be the Bosch Rexroth 40x160mm.

BUT .... the extrusions on my bot measure exactly 6" x 1.5" (or 38mm x 152mm). I have looked around and can't find Bosch or 8020 with those dimensions....

If anyone can tell me what product this is, I would be most grateful.

Anthony Jules