replacing roller on a window regulator...

bought new roller for window regulator at LMC truck ,but not sure how to
replace them, i can drill the old one out, but how to get the new one to stay on, it doesnt have threads or anything at the end, pop rivet might work, anyone replaced these before?

Pop rivit,small machine thread bolt,either one will work fine.If you don't have the large pop rivet gun then just use a short(cut if needed)machine thread bolt.