TAG Heuer Aquaracer bezel fell off

My bezel fell off the other day and I cannot find it. I send the watch to Tag a couple of years ago to have it seviced and to have this issue addressed. My issue is now do I send it back to tag to have the pieces put back on or is there a reputable place that sells the parts I can just have them ordered at I’m assuming I just need a basil and maybe the clip spring that goes underneath any help us appreciate it thank you