I've got one right here that will do the trick. Bottom end exactly matches my 23" Tempo and the steerer is 210mm, 80 of which is threaded. Easily works for a 25" Tempo frame. Not a Schwinn fork, but it's 4130 Cro-mo and made in Taiwan. It's a slope top crown, it's chrome, it has a single lower braze on for fenders like the original fork, and it's in really nice condition.