I am clueless when it comes to anything but posting pictures.
I watch Rainman Ray' a fellow from Florida, great funny mechanic, **** poor welder thou.
He did the center slip joint on a 2015 1/2t Hope it works for you.
https://www.youtube.com/watch?v=6tU2My2CXgg
PS looks like I figured it out, there are a couple ads at the start
H said wire the boot, or just let slip, that will let dirt in I would think, Hi grade zip tie's???
I would think you should be able to buy those band clamps, But us old farmers use wire for most stuff, out in the field, hammer , wire, pliers= toolbox.
A PS, Ray used a tube of blue spline grease , it was a Ford product. the customer said it would thump when coming to a stop , the grease fixed it.