Not really an exact answer to the last question... but an easy (not cheap) solution...
ORD: Off Road Design has a 1" body lift kit that comes with the correct extended length bolts. I will probably go poly with the 1" kit so I dont have to search for washers and bolts....
Grade 8 would be overkill so probably grade 5...
http://www.offroaddesign.com/catalog/oneinchlift.htm
