D Bat 6×6 Brake spares

My d Bat is currently being overhauled before being fitted with snow plow
it looks like we are going to need new pads/discs etc.
does anybody have any idea how to get these or where
also are there caliper repair kits available for these.

I would be most grateful for any assistance with this and any general tips on general maintenance for these beasts!

Many thanks Grizz