Purchased these Auxito LED bulbs to replace the weak halogen dome and map lights in my Jeep Wrangler. The Auxitos is a perfect replacement fit for the 921 style lamp. The light output is 10x brighter than the original halogen bulbs. My interior sees so much better with this extraordinary illumination. I love the instant-on, clean white-light look. Installation can be a bit tricky in some of the smaller spots they like to put these bulbs. The boards on the base of these can be a little thicker than the wedge on a glass bulb but they actually provided a little plastic tool that can be used to open up the socket a little and make them fit perfectly.