i went with the blendmount one, a bit pricey but fits perfect and allows for operation of the manual dim. i also used their wire harness as well. as for the wire cover, not sure if those would work with the non-power mirror but you can get those at courtesy nissan
COVER-INSIDE MIRROR - 370Z (Z34) 2009+ :: Nissan Parts, NISMO and Nissan Accessories - Courtesyparts.com