I have contacted the seller -who is NOT the one that had all the CSL and Alpina stuff a while back, that guy was in SF -and he/she verified that it is a copy, see reply below. Also, regarding the stated shipping cost, in the sellers feedback, on one of the few sales by this person, the buyer gave a neutral rating, complaining about the expensive shipping.
" This spoiler happens to be made from a mold of one that was sold by Alpina, but please understand that Alpina did not produce these spoilers originally. They hired a fiberglass company to produce them. This is the exact same thing, but technically not bought from Alpina. There is absolutely no difference, even the Alpina logo is on the spoiler as you can see in the pictures. Alpina did not put part numbers or anything else on these spoilers to differentiate them from a copy. They did start to do this when they became a production company in 1978 even if the part was subbed out.
The early stuff which this spoiler is part of, could have been made in someone's garage as Alpina was not producing many cars early in the 70's, about 500 cars total per year for all the models. Hope this helps. If you have any further questions feel free to email me. "
And, @ Bert and others interested in getting them directly from Alpina as Gosch sugggested, what about a group buy? If the shipping from over seas is made more reasonable as one lump shipment to someone in the US who then ships them out to everybody else, it COULD come out much cheaper. We just need to get the actual shipping costs to do the comparison. The last time I looked, the exchangerate was not as bad as last year.... just something to think about.