See
this thread for scans of Birdview original sales material.
They call out
8, 9, and 10 foot dishes (zoom in), in solid and perforated.
First thing is this: the 9' dishes are what we call 8½ foot, measured straight across from rim to rim.
That's the honest way to measure a dish.
Second thing: some members have solid and perf in the 8½ size, but no others.
Linuxman has both, and they apparently both perform equally on C & Ku.
So, all solids are one size: 8½
The only perf we've seen is: 8½
Nobody has come up with the smaller nor larger perf, from Birdview.
There are a number of similar dishes around of equal and larger size, but if they're not on the unique Birdview mount, then they aren't even related to Birdviews.