You need a threadless style fork.

You need a fork with a 1-1/8 inch diameter steerer tube.

You will probably need a number of spacers to make a fork work with you short frame head tube. Or, you can cut the steerer tube to a shorter length to accommodate the short head tube.

Ideally you should choose a replacement fork with the same (as close as possible) length and rake as your current fork so that you don't alter the bike's geometry (too much).

You'll need to take some measurements and provide us with the numbers before we can make recommendations


Rake (offset) explained.

https://www.bikecad.ca/fork_offset

Axle to crown explained

https://www.bikecad.ca/taxonomy/term/52