Here are the dimensions of some of the discs mentioned so far. A lot look pretty close to the zone. I added the Cro as a similar disc, I believe it was Brother Dave that told me they were very close to each other.
Discraft Zone 175.1 21.1 2.0 1.3 18.8 1.2 6.2 46.00 10.55
Innova Cl Roc 176.0 21.2 2.0 1.2 19.4 0.9 5.7 42.75 8.96
Innova CRO 176.0 21.2 2.0 1.4 18.5 1.3 6.6 48.50 6.24
Innova XD ret 176.0 21.2 2.0 1.2 19.4 0.9 5.7 42.75 8.96
Lat 64 Pure 176.0 21.2 1.8 1.4 19.2 1.0 6.6 48.25 6.69
Lat64SinusAP 176.0 21.2 1.9 1.4 19.3 0.9 6.6 50.75 9.75
Lat 64 Spike 176.0 21.2 1.8 1.3 19.2 1.0 6.1 56.25 4.65
Discraft Zone 175.1 21.1 2.0 1.3 18.8 1.2 6.2 46.00 10.55
Innova Cl Roc 176.0 21.2 2.0 1.2 19.4 0.9 5.7 42.75 8.96
Innova CRO 176.0 21.2 2.0 1.4 18.5 1.3 6.6 48.50 6.24
Innova XD ret 176.0 21.2 2.0 1.2 19.4 0.9 5.7 42.75 8.96
Lat 64 Pure 176.0 21.2 1.8 1.4 19.2 1.0 6.6 48.25 6.69
Lat64SinusAP 176.0 21.2 1.9 1.4 19.3 0.9 6.6 50.75 9.75
Lat 64 Spike 176.0 21.2 1.8 1.3 19.2 1.0 6.1 56.25 4.65