Pentair SAM Light Replacement

Our Pentair SAM pool light failed. Any attempt to light it trips the electrical system. Water was in the light and after opening a lot of the parts are corroded. So, long story short, I'm going to need to replace it.

Can you tell me if anyone sells just a 8 3/8 NICHE (which would include the wiring)?
I just bought a new gasket for the glass shield that is fine so I'm hoping to find the back parts plus wiring to save some money. Also, I've got about a 75 to 100 foot wire run to the light.

Thanks in advance for any tips or pointers.
All the Best,
Paul