If you have what I'll call "Custom" Velvac mirrors mounted on one long arm, a glass shop may be able to fix it. If not, should be able to give you a lead.
We have the basic "rental truck" mirrors as pictured. You can get a complete head that'll mount pretty much anywhere.
Even the chain store auto supplies that are open every day should have a replacement glass for something, and some double-sided tape to attach to what's left of your mirror.
Improvise till you get where you're going then work on details.
If God's Your Co-Pilot Move Over, jd
2003 Jayco Escapade 31A on 2002 Ford E450 V10 4R100 218" WB