Went to Fastenal and got some bolts and acorn nuts. The bolts supplied with the winch are Grade 8.8 M12 x 40mm. I went with Grade 10.9 M12 x 50mm, because they are stronger and longer but more importantly that's all they had in stock.
Warn winch plate with Poison Spyder spacer plates from Northridge 4x4. Need to get longer bolts for the hawse fairlead, but pretty happy with the install.
The case is soft metal. Start with a small drill bit to center the hole, then use a step bit to make the hole big enough for the cable. Not to worried about the original hole, because that box is not waterproof. I'll probably stick a whiskey cork in it.
Borla Climber ATAK part#140810. Bolt on with no clearance issues. Did it by myself with a creeper, tools and floor jack. Removed stock exhaust in one piece by lifting drivers side frame and letting both wheels hang. And yes, the Sunrider is sweet.