Uniden 520 = 1.5” (Blue Bezel)
Uniden 538 = 2” (2nd pic of OEM Bezel)
Cobra 19 = 1.75” )your radio)
When you use the insert piece like pic w/520 in it, you are talking a radio that is ¼” shorter than the Cobra.
If you compare the Uniden 538 and the Cobra you are talking ¼” more height and it would fit BUT the pic with the Uniden 538 (second bezel) is using a separate double din bracket and it requires cutting of the OEM Bezel to fit before you even start attempting to fit the Cobra.
So in order to fit your Cobra 19 you will need to cut some of the OEM Bezel and all bets are off on the fitment of the actual CB.
Measure the Insert above your radio, compare with your CB to that measurement.
IMHO, If you have to cut into the OEM Bezel you are getting a little hokey… the Uniden 520 fits and with a small piece of plastic or other material looks good. You might even mount a connector or two on either side of the Uniden.
If the insert is smaller than your CB it might not be a good idea.
if the insert is larger than your CB then you are in business.
Think about a Uniden Pro520XL CB to replace your Cobra.Your pi of the Antenna Mount, how is your CB working, how is the SWR ?
Grounding is important and believe it or not the truck bed is not a good grounding point.
4x4, 5sp, Std Cab, Stepside, E4 Red
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