they bolt in place of your stock ones. you can cut the inner studd off and there's no mods needed for installing them on Mavericks
thats what i did or if you dont cut that stud off you just need to drill 2 holes. i didnt drill in case i ever wanted to swap back
X2 I also think if i was gonna do it id make them work but im not too terribly fond of that look anyway.
used on bobcat's from 75-78 [& 74 in Canada] Some were anodized aluminum like the Mavericks bezels, others (I believe the 77-78) were chromed pot metal