I've personally used the DDM and would recommend them over the eBay. I just ordered two more sets of them Saturday. You could use either of the 35w or 55w in our housings. The 55w are extremely bright and produce very little blue tint that everyone likes. The 35w are bright also but can produce the blue and purple tints. I'd recommend the 35w for the XX, 55w would be overkill and may not last as long also.