That unit is considered a single DIN. From the 'net:
The US standard for a DIN radio is 6.83" x 2" (although the actual 180 mm width converts to something like 7-3/32" so most people use 7-1/8" to allow for clearance).
If you use the dimensions above, you should be able to mount the DIN cage in the opening and then the unit itself will be able to be inserted and removed from the cage.
Read more about the DIN standard here: https://en.wikipedia.org/wiki/ISO_7736
The US standard for a DIN radio is 6.83" x 2" (although the actual 180 mm width converts to something like 7-3/32" so most people use 7-1/8" to allow for clearance).
If you use the dimensions above, you should be able to mount the DIN cage in the opening and then the unit itself will be able to be inserted and removed from the cage.
Read more about the DIN standard here: https://en.wikipedia.org/wiki/ISO_7736
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