The fresh air intake is delivered in 2 parts (upper & lower). This allows rust-protection for the lower parts which are exposed. At the upper part there are also anchorages for the clips of the trim moulding. At the lower part you can find anchorages for wiper motor. The Mustang Monthly's website has "How To" articles posted, Below is a link to "How To" install this product (in this article a 67-68, but the same principle to 64-66). http://www.mustangmonthly.com/howto/mump_0611_ford_mustang_reproduction_cowl_replacement/index.html