I belive i have the same lights you just purchased, i got mine at walmart aswell for $20. 00, im on my second set (rock busted one light out) they work really well for the price and really light up the road. for mounting i stuck them in the hole with some clear tape and went to my shop at night and got them both alligned properly and when i was happy with the light pattern i used a little hot glue and silicone on the back side to hold them in (very strong actualy, i was suprised when i swaped them out i actualy had to "TRY" to get them out), when it comes time to replace them it is a mater of poping them out (5 min. tops). putting new ones in, 2 wire conections, a little glue. Looks factory, takes 5 min. to swap them out, and only $20. 00!!!!!! vs. $200. 00+