Straight 1 1/8" steerer tubed 24" or 26" suspension fork, needs to be QR.
Set of reasonably cheap hydraulic brakes, eg Shimano MT201s etc. Anything considered, don’t need rotors necessarily but considered. For a kids bike to replace mechanical disc brakes.
As short as possible I guess, they’re not long travel on there just coil, heavy and almost seized so anything will be an improvement. I guess there’s a practical limit without messing around with the geo too much. I’ll have a measure and PM you this evening. Thanks.