LED Lights

Thanks for the advice. I would be replacing the stock 921 bulbs. I like the idea of the cob style but I am a bit confused about the 5050 vs the 1210's. I am guessing that the 5050's are a bit bigger or brighter? Could you please tell me what the best (most like an original 921 bulb) LED Cob would be (5050 or 1210) and the # of LED's to match the light output of the 921.

Thanks in advance. Don.