The Part# you listed below (FLS50U50BP1/G2) has been “Phased Out” , and unfortunately, we no longer have any stock.
This fixture was unique because it had two mounts in one, both a “trunnion” mount and a “1/2” threaded knuckle” mount. The replacement fixture does not have the same versatility, you will have to chose which mount you prefer. I have listed both options on the quote, see availability below.
½” Threaded Mount:
Part# MSF50UW-50BKT 30 in CA.
Part# MSF50UW-50BY 29 can be built in CA. (1-2 week lead time)