my trailer has the 921 bulbs in the ceiling lights . we want to replace them with the 921 base but the LED's. I found these on Amazon but the price seems awful cheap for 10 of them for 20.00 bucks. ...
You want a light temp that is 3200 or lower, or it will be a very cool light. Also check the light output---find the lumens on your current lights and check on these. My guess is that it is rather low.
We got LEDs at LEDtrailerlights.com and they were great.