Need some help i cant find any forks for my gsxr 400 gk73a just wanted to know if any other forks will fit it

Try something from a 600 or RGV 250, most Suzuki stuff will be interchangable but you'll need to know the basics of fork diameter (if you can use your yokes) wheel spindle diameter.

If you move away from Suzuki it might get a bit more tricky with different dimensions if that's the case it might be better to consider a full front end

Thanks for the info will look in to it