Replacement forks advice

[CyclingStu]

Hi guys. I'm looking for advice for replacement forks for my Specialized Rockhopper which decided to disappear the other night. Will any forks fit? Are they all the same size. Could anyone give me a guide as to comparable forks to the original ones that are cheaper? Thanks for any help, Stu.

 

[Mr Pig]

How old was the Rockhopper, what forks were on it?