2011 800s A Arm Attach Point Repair

I will be ordering the "Step Washers" to repair my wallowed out a arm attach points on the frame of the front of our 800S and need some info from anyone who has also had to make this repair.

I would like to order new grade 8 (or higher) bolts for the a arms and need info on how much longer a bolt to order given the added "step washer" thickness, what length of threads, and any source for these bolts — as well as the Nyloc nuts to go with them. I want slightly longer bolts so I can also use washers under the nut and bolt to further "spread" the load.

Any other tips on making this repair would be appreciated. I have read most of the material in the archives.

Cheers,

db