Guide rails for fence

I am looking for the longer guide rails for my original fence. My rails are

Well the brand fence you are using might help. Otherwise, Jet used to offer fences and rails as an add on to most any brand saw. IIRC Beismeyer also sells fences and rails.

Are the existing rails tubular or rectangular? If tubular, good luck in finding any, I couldn't a few years ago. Eventually, I made a new fence using a rectangular rail; however, before that I extended the tubular ones with wood....

1. turn wood to outside tube diameter
2. turn 6" or so of #1 to tube inside diameter
3. cut a flat on the inside diameter; I faced my flats with pieces of 1/8" steel

1. insert into existing metal tubes
2. secure wooden extensions with a thumb screw.

It might be a lot better to just get another fence, assuming you could afford it.