How to get parts - Garmin DriveAssist 51 LMT-S with a cracked screen.

The specific device is not listed in ifixit, but this is “close”. I have a Garmin DriveAssist 51 LMT-S that fell and broke the screen. It barely responds to touch and not reliably. I contacted Garmin, who says they don’t have parts… the will replace it for $139.00, which is what I paid for it. I assume replacing the screen is similar to working on a cell phone, but I have no idea how to find parts needed… I’ve searched a number of sites online with no “joy”. Suggestions? Thanks.