So you have the old one - right? And it's cracked? WHy not have one made? What do you think one should cost? Looks completely straightforward to me although the picture is small. Probably cost an arm and a leg if you had me make it but there's alternatives.
If it's made out of ABS there's MEK (a solvent) that melts ABS parts
. So you can dribble some MEK in the cracks and they will weld back together as the MEK evaporates. A chemical weld - Could be as good as new.
Also there are plastic welders out there that use heat to melt the parts
together at the crack - hopefully with some filler rod of the same material. The challenge is to figure out what material it's made of. The usual choices for something like that would be abs, pvc, acetal ( and unlikely uhmw).
I recently bought an epoxy
labelled "for plastics" at a hardware
store chain (Doit Best). I couldn't figure out what my parts were made so welding wasn't working. The epoxy
worked great - the temporary fix I made with the epoxy (this wasn't the usual boat epoxy) is holding up to this day and the replacement part I ordered is being saving for the day the epoxied part finally does fail.
You could fix the cracks and use it as filler where needed and fix it up yourself and likely do a great job if you haven't found a replacement.
I work with plastics every day and I was impressed with this epoxy - it way exceeded my expectations.