i put one in too, but did not put the plastic trim piece back on the head unit. you can actually drill or extend the holes in the metal bracket to change the position of the unit. as far as the gap i have a tray from a unknown subaru in there but it does not fill the gap. i'm thinking i should custom make a plate for that gap.
'93 Winestone SS Auto, '91 Pearl White SS.
'93 Pure White SS EJ20G slanty intercooled, SIDESWIPED! In stasis.
'94 FWD and '95 AWD Laguna Blue SVXs.
2017 Pure Red BRZ Limited w/Performance pack
I have one of the 1.5 DIN trays, came in my wife's blue wagon with the am/fm only radio. I've been hanging onto it in case I ever put an aftermarket head unit in... not for sale, just saying they are out there. Look on the L's, basic low end models.
'90 Bermuda Blue L Wagon (Wife's),
Auto, AWD, Now with 275K + miles!
The metal plates on the sides are factory. To the best of my knowledge they are the same on all '90-'94 Legacys, regardless of factory installed radio.
'93 Winestone SS Auto, '91 Pearl White SS.
'93 Pure White SS EJ20G slanty intercooled, SIDESWIPED! In stasis.
'94 FWD and '95 AWD Laguna Blue SVXs.
2017 Pure Red BRZ Limited w/Performance pack