I like those ones - a lot of the other hood vents are larger than the stock ones - I think the stock size is perfect - just want it in gloss black rather than bodymatched colour.
Actually from looking at the installation video again, that control panel switch isn't used for the install - its just dosconnected to allow access but there's no modification or use of that actual armrest control switch.
Like me, you don't have the spacers that come with the Tower brace for RHD Mustangs. I'm currently trying to source them without having to buy the full 'kit' :
Performance Strut Tower Brace Kit aluminum - Ford Online Accessory Catalogue (ford-accessories.ie)
I put those on too as well as the American Muscle LED Diffuser Lights to replace refelctors over the exhaust pipes. I also then couldn't resist the front DRL Fog Light Sequential Turn Signals :
Here's one of doing it: Forten Kingdom Car Automatic Window Close And Mirror Folding Unfold Module Kit For Mustang Gt 2015-2019 - Intelligent Window Closer - AliExpress