looking to upgrade to resin top rails from my current rusty steel ones

Is part # 22788 a compatible replacement for part # 21387

I own a sharkline oceanic 54" walls w/ steel top rails

Pool purchased ~ July 2007

The 22788 resin top rail can replace the steel 21387 rail. Unfortunately, we are currently out of stock on the resin rail. We won’t be able to get more until 2020. We do have the steel top rails in stock.