Yep, an easy fix. Just use a thin wrench, pop out the bolts, install the new one, and replace bolts. As I remember there is a proper orientation of the fanclutch so make sure you look when you take it out.

There are some videos suggesting that you soak the bolts overnight in Liquidwrench or something like that. However on my '81 SD I had no problem not doing this and the bolts came loose easily.