The standard head unit is 1 DIN, which is a standard size. It has a cosmetic front that makes it appear to be 1.5 DIN, which is a non-standard size.
As to what DIN is, this definition is pinched from wiki answers:
Here are a few threads covering upgrades.International standard ISO 7736 defines a standard size for car audio head units. The standard was originally established by the German standards body Deutsches Institut fur Normung, and is therefore commonly referred to as the "DIN car radio size". It was adopted as an international standard in 1984.
Head units generally come in either single DIN (1 DIN), which is 50 mm high; or double DIN (2 DIN), which is 100 mm high.
http://www.aulro.com/afvb/discovery-...ereos-d2a.html
http://www.aulro.com/afvb/discovery-...placement.html
http://www.aulro.com/afvb/discovery-...e-show-em.html
http://www.aulro.com/afvb/discovery-...o-upgrade.html
http://www.aulro.com/afvb/discovery-...acement-2.html
http://www.aulro.com/afvb/discovery-...head-unit.html
It's also worth having a look at the Communications, Car Audio, and Electronics sub forum.
cheers
Paul


				
				
				
					
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