If they broke off below the surface, then your going to have to replace everything. You can get the complete assembly and installation is easy and straight forward.
Peel the old sealant off, remove the mounting screws. Lift old base off and install new one. Apply new sealant. Dicor self leveling, and if you find putty tape under the old base replace it too.
The entire process shouldn’t take more than a couple hours. Parts aren’t that expensive.
2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.