rear lower strut bolt

[FlowmasterFestiva]

does anyone know the size and thread of the rear lower strut bolts because im going to need new ones when i change the suspension. friend tried to take them off to put the last bolt on the spindle and it wouldnt budge. used almost every kind of lubricant there is and still nothin.

and yes the right rear spindle only has 3 bolts holding it on