[HO455]

I am assuming it is a leaf spring truck? Is it lowered?
There is an angle bracket that your current bearing bolts to it will need to be removed and the inline bracket installed. Leaf spring trucks and 3/4 tons use the bearing style in your first photo. I believe there are more than one ID of those bearings depending on the gross weight rating of the truck. You should verify the ID of your current bearing as it may not match the billet style.
I ran one of those billet bearings on my Burban for a while without issue. There are some things to consider going it to the conversion. The new style bearing holds the front shaft in place and you will need a slip joint in the aft drive line. A leaf spring truck should already have the slip joint installed.
Since your going to have to install a new carrier bearing mount you will need to measure your drive line angles to make sure you install the new mount at the correct height.
Make sure that the billet housing doesn't tilt or twist once it is bolted securely as the polyurethane won't compensate for any misalignment like the factory style will.
Some poor photos of mine installed and hopefully showing the inline mount and the arrows showing the rivets that hold it in place.