where to find the replacement for cracked sta-rite niche and install it

[fzuray]

my niche is cracked, the pod of the niche is thin like a copper paper. I do not know for what reason, maybe I did not put the pool light into the niche for 2 years, or maybe the PH was too high or to low in the pass 2 years.
now I want to buy the parts and replace it .
Q1: from the face plate, the model is wc3-53ss. and after reasearch, I found that the niche is sta-rite, which was accquired by Pentair.
now I need to buy the niche(Part No. 05068-0122) and the 2 gaskets(05057-0667) at least. does anyone know where to buy it , or buy the alternative?

Q2: when replace the niche, do I need to cut the concrete flow

 

[ajw22]

Welcome to TFP.

Is this a vinyl liner pool?

Can you get behind the pool wall?

 

[fzuray]

yes, vinyl liner pool
it is a inground pool, I do not have access to the behind of the pool

 

[ajw22]

yes, vinyl liner pool
it is a inground pool, I do not have access to the behind of the pool

I think that is going to be a problem with how you connect the niche to the light conduit and how you hold the back in place to screw it in.