Caliper bolt behind the sliding pin won’t go in

Guys im sitting in my garage trying to get this bolt to go in, its the bolts behind the sliding pins, it’s like they’re not even the sane size anymore and won’t screw in, any help would be amazing. Nutzandboltz video seemed so easy but i feel like im in over my head, don’t know why these bolts aren’t screwing in?

 

Its these bolts right here

 

i got the top one to go in by moving it a little bit but the bottom is not going in it just keeps on screwing and not tightening

 

Its not aligning right for some reason, excuse my nubeiness, but what’s a thread? I did lube the sliding pins, how would i screw the bolt into the pin? Because it has to go through the caliper

 

Ok i screwed the bolt into the sliding pins after i took the caliper and hung it up again with a bunggee and they’re screwing in, i just cant get the calpier to align

 

Trust me i tried doing exactly what you said but eventually i checked out the piston opening and it wasn’t aligned, once I aligned it the caliper fit on like a glove!

 

Man i really hope I don’t run into a seized caliper, I don’t even know what it looks like. Haha. I eventually got it the piston wasn’t aligned properly so it finally fit after getting that down

 

Oh and just to let you guys know the Toyota dealership told me my rear brake pads gad 4mm left and were in the danger zone at 100k miles, well, they were just a little more worn then my new ones so I didn’t change them and just used some brake cleaner, my rotors looked just a little rusty but still almost new! Thought the dealership would be more professional then a small town shop!