they are the old reference series. its not the oval ones, but the speparate ones ( a 4" woofer, and tweeter). the covers do not fit on mine since i had problem with the woofer hitting the platic when i had it on. they sound nice but one of them went out because of the hot weather making the glue from the cone and rubber separate. i need to fix that.
here's a link if u want to chack it out.
http://www.cardomain.com/member_pages/view_page.pl?page_id=335117&make_type_query=make%3DMercedes-Benz&model_brand_query=model%3DS-Class&tree=Mercedes-Benz%20S-Class