It should fit if you replace the turbo outlet to exhaust pipe casting on the rear of the turbo. I took a PacBrake off my '97 when I traded it and put it on a '00. I don't have the part number handy, but if you check with a PacBrake dealer, they will have the Cummins part number. It's been quite a while ago since I made the change, but I think the casting from Cummins was less than $35.
Bill