According to the DeWalt web site the mounting hardware and instructions are included.
Yes I used them on my 745
No. If you have the brackets pictured above they will not fit your DeWalt DW7440RS heavy duty fooling table saw stand. You need DeWalt Part # A23620. If you look at the DeWalt parts list for your stand DW7440RS you can see this information. The brackets pictured above DeWalt p/n DW7231 fit DeWalt stands DW723, DWX723, Dwx724 and DWX725.
It did not fit my R4122 RIDGID 15 Amp 12 in. Dual Bevel Miter Saw with Laser. the holes are just a little too far apart for them to line up with the brackets. I had to make a custom adapter to mount to saw to these brackets.
Yes they come with the appropriate bolts and are very easy to install.
Yes, these brackets will definitely work.
There are bolts included in the kit.