I doubt anyone is going to know what a first generation 4 Corners looks like. The current one has a thru axle and flat mount, like this fork:
https://www.ebay.com/itm/31652287039...Bk9SR7L0goy3ZQ

But you might have a different axle and mount:
https://www.somafab.com/archives/pro...-for-wolverine

All City, Velo Orange, Soma, Surly are all companies that sell this kind of stuff and have good reputations. What we can't guess is your fork's axle to crown measure or rake. It is probably a straight 1 1/8" steerer, and many forks that have the right mountings will likely work okay.