Switchblade key posted by jmalone on February 16, 2010 at 12:34 PM
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A lot of the 350Z owners use Mazda keys and transplant their key stalk and the guts from their keyless entry remote into the Mazda housing. They are larger than the VW key and a little easier to work with from some of the threads I've seen.
Something like that may be your best bet for making a switchblade style key work.
Z1 Motorsports 770-838-7777 ex 302 www.300zx.com AIM bryanatZ1