The reason appears to be the same as for quite a few internet dealers of Mopar parts. There is no oil filter at all currently listed in their online database for a 2008 Viper. Probably, due to the item not being available in their supply chain, it was removed from some database that these companies use. Or it was mistakenly deleted. Their software looks for whether a part in the database says it is for a 2008 Viper. Since there is no such filter in the database, it uses the text response that was programmed for a negative match. Other online Mopar parts dealers have a little better software and/or database and their software reports "Currently Unavailable" but, does report "Fits 2008 Viper."