Right after I sent my prior message, I got the response..funny...here it is:
We hold: 79.3mm x 64.77mm (3.125 "x 2.550") and NOT smaller for Garmin Zumo 550 touch screen.
If you can buy in our store.
He is quick at adapting, look at his ad now...anyway... I fell for it and sent my $35...hopefully won't be duped...