NHTSA Complaint #11458840 — 2011 CADILLAC SRX

My headlight assembly have been taking in water for about a year. Last year I had to replace the ballast on one side. Last week we had a lot of rain and while driving home both of my headlights went out. I’ve looked up the problem online and found out I’m not alone. Cadillac did send me a notice last year about a settlement they made for similar issue but the notice they sent me stated it was for models with halogen bulbs. My vehicle has HID. I have called several dealerships and was told the part cost about $1400.00 each. I want to replace both sides. They say they don’t have both available. My guess is there’s a shortage because everyone has this problem. Cadillac should have been made responsible for selling this garbage. This is a safety and consumer problem. How can I drive my vehicle if I can’t even replace the part ?