Want this question answered?
YES, The cabs are the same.
yes
No, it will not.
yes
YES, They will fit with no problems.
No everything about it is different.
yes it will i did it
YES it will.
Not without modification as 2000 is the newer body style which was implemented in 1999.
YES, It will bolt right in.
They should fit. Try going to impalassforums.com to see what specific years will fit
yes, as long as it has the same box syle body like an 84 silverado would have.