Pricing Questions - Please Help

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I need some help w/ pricing a few things, the blazer I bought has some parts
that are duplicates of things I already bought, I want to sell the stuff, but at
the same time most of it is brand new still in the box & I need to get most of
my money back if possible, although if I price it to high it will not sell, So how
do you guys know what kind of price to put on something, here is 1 example,
set of 72 door mirrors, complete L & R, never unpacked or mounted, I'm going
to use LMC for my examples, they sell them for $39.95 ea. + shipping, which
would make them around $90.00 a pair shipped on average, how much can I
expect to sell them for, I realize that Vendors sell the same stuff at different
prices, each vendor that is, so how do you price it fairly without losing your
butt on them, have alot of stuff duplicated and need your help please.