ULX Group Help

Hello on my server I wish to implement a Donater group. Im using the newest ULX version. I know how to make the group and give it things such as votekick but how would I go about making it so that once you become a “donater” everything you spawn you get a certian swep such as BuddyFinder. Im using DarkRP as a gamemode and I don’t know if that would conflict it or not.