I normally remove the fan by jacking up the truck and dropping it down, this video shows a top removal process. SSRs may or may not have bolts, I have seen many factory installations that were held in with zip ties. Not a big issue, the mount tabs are rather large and I have never heard of a fan falling out.
Here is a good video of a top removal process – https://www.youtube.com/watch?v=kTS_qmhL4Bo Also – https://www.youtube.com/watch?v=VugEWlWRVDM