I bought my tail lights (and a few other things) from e-bay also. I think the thing to remember is to buy from a "reputable" seller that has at least a 98% rating or higher. Take the time to read the buyers responses/comments about the seller, and see how much negative feedback there is.
Unfortunately I don't recall off hand what my seller's id was either. Sorry.
Once last word of advice, ALWAYS comparison shop b/c a lot of sellers will "rape" you on the shipping charges.