I just did this on mine a few months ago. I thought the thread was m10 x 1.25, but I am not sure. Check by matching your tap with your bolts you removed. You can stack your tap on top of your bolt so the thread are touching each other and if they fit togethor like a zipper then you have the right pitch and thread count.

I sprayed some lube on each hole as I was running the tap to limit the friction, and blow the hole out once I was done, to get all the trash out.

Just checking you did get new bolts?

91 Montero LS "Sandstorm", Auto, Dual Bouncy Seats, 2" Suspension lift, 2" Body Lift, GENII front IFS, 32" MT tires

89 Raider "Trailbreaker", 3.0, Auto, Dual Bouncy Seats