Shock absorber upper mounting plate-to-frame nuts (M10) 48 35

I need specs on this part so I can pick some up at the hardware store. I have been running a 2.5 leveling kit for awhile that replaced the standard nuts and bolts that held the upper mounting plate to the frame with longer ones. I am replacing this with a procomp prorunner shock/level system and deleting the 2.5in leveling kit. As much as I trust the guy that's doing the work for me I would rather run out and get the proper hardware myself before I drop the truck off.

Any help would be greatly appreciated!