Looking up your head unit on the Alpine-Europe website says:
Dimensions
- 1 Din Size
- Chassis Size (W x H x D) mm: 178 x 50 x 160
General
- Power Requirement: 12 (11-16) V.DC
- Pre Output Voltage (Before Clipping): 2 V
- Maximum Mounting Angle: 30° from Horizontal
- Weight: 1.2 kg
Max Power Output Ratings
- Max Power Output: 4 x 50 W
All of this will be important information when comparing a new unit (except for weight, that is not as important), full specs can be found here:
www.alpine-europe.com/p/Products/cd-head-units19/cde-120r 
