If only there was an online garage sale type of store where people could buy and sell used items including auto parts. An electronic "bay" of some kind.Does anyone know where the part could be purchased cheaper than $313?
Alternatively, you could try to repair the fixture with silicone caulk applied to wherever the crack/gap is (probably on the top or sides). That's what I would do before spending some real money. If it works, you are good. If not, well you've got some practice removing the assembly for replacement.