I believe they filed for bankruptcy about 8 years ago, so this may be difficult. What exactly do you mean by an "end feed," and why do you need it now?

I don't see a website for Catalina Lighting, which is usually a bad sign for parts availability.

I do see lots of hits for Catalina-brand luminaires though, including track lighting. My guess (and it's only that) is that some VC bought the rights to the Catalina name at fire sale prices and is pasting it onto generic imported products. But then, that's what Catalina itself did for much of its time on this earth. :)

There's an interesting company profile for Catalina here, but its history track seems to end at 2000, so it's probably too old to be of much help..

Either way I expect you'll have trouble getting parts for your kit.
You might get lucky and find a similar system that's been retired that you can cannibalize for parts. Try garage sales, thrift stores, ReStore, Craigslist, and Ebay.

I even saw a listing for a batch of new-old-stock Catalina parts on Ebay. Don't know if they'd work with your kit, though.

You might want to consider just replacing the entire kit. Modern ones with LEDs will save you a little on your power bill, produce less heat, and most likely never need relamping. Maybe you can make some of the cost back by parting out the old one and selling it piecemeal on Ebay.