Mine are the 1.5" ones. I think a 1" would be better as you wouldnt have as much sticking out of the guard but the good brands dont make them and i didnt really trust the chinese ebay ones. I would also be concerened the existing threads would be longer than 1" so they would interfere with the mounting surface for the wheel. Hope that makes sense
I bought mine locally from SBR offroad put them on over a year ago and haven't had a single issue. I did a lot of research as well and never found a single negative review about them. They are loctite on and torqued so i dont see how they could come off.