Kelsey Hayes caliper bolts

I'm just wondering, are those special type of bolts really important to install because I just sold a set from another kh setup late last year and I just did the mustang rotor swap and when I took off the calipers it had regular grade 8 bolts in and I've been driving the hell out of my dart for 5 years with this setup, even drove it twice from California to Wisconsin as well as race it on the track at Brainard raceway in MN twice at the power cruise event as well as drive it multiple times back and fourth from Phoenix az to central ca. It's pretty much a daily driver but anyhoo im just wondering.