I just did this in my 04 Nissan Frontier. The mount area is a Double Din and allowed me to use an aftermarket Kenwood Single DIN headunit and then the In-Dash housing from Digitalww.com. Armen at digitallww can put a Lilliput, Xenarc or Pioneer (?) into the housing for you.
The nice part about it is that it tucks into the housing providing a very nice and secure finished look and there are no modifications to the car. Heck, I was even able to use my existing brackets from my stock radio. YMMV!