What I have found with this, The problem with making your own transmission drop is the factory bolts have a tapered shank on them that is hard to find. most people go straight for the grade 8 bolts and just buy a standard hex head bolt, BAD!!!
If you go this route, there will be slop in the skid plate and it will shear all thoose nice new bolts into two (Don't ask how I know please, just trust me) The hole in the skid plate is about 1/8 larger than the shank on the properly threaded hex head, this allows for easier instalation. the tapering is what eliminates side to side motion.
The factory bolts are only grade 5 bolts, there is not a lot of lateral torque applied on them believe it or not when tighten properly. I found that my local Lowes has a bolt that works quite well. I found it in the "specialty bolt drawer" I simply brought the factory unit down matched the tread (I think it is a 1/2" 13 thread bolt, but don't quote me, this was a while ago) matched the taper, and got one 1" longer.
worked the balls! torque to 75 ft/lbs and call it a day!