Luminaire centenaire en métal

The bracket that holds on the top dome breaks all on it's own, without contact from anything. I believe it is due to expansion and contraction of this wishbone part putting stress on the cast aluminum part until it breaks. Parts not available, guaranteed if you buy a replacement, it will happen again. I have two of these fixtures, and both have broken. You can fix with epoxy if you are patient and screw the part back into the fixture without the dome until it cures otherwise it may not fit back on if you cure it off the fixture.

I have the kicker 15310bkt pathway light. Where can I order or get replacement bulbs.