2002 To 1999 Timing Cover Swap...

You can swap the timing covers out. Just unbolt all the accessories, remove the old one, clean the surfaces nice and good, and put the 3 bolt tensioner on. And you might as well put new timing cover gaskets on too. And, really, since you're halfway there, you might as well take the valve covers off and get that stock cam out and put a mild cam in, lol!! I mean, you're kinda right there anyway. All that can be done in a day. But anyway, you're much better off with the 3 bolt tensioner over that single bolt nonsense some idiot came up with. Sometimes I swear I don't know what they be smokin that they decided to change the perfectly working 3 bolt style to that stupid 1 bolt nonsense.

If you upgrade to a newer blower, it should bolt right in place of the older one.