The holes matched up perfectly.
I ended up choosing the PRV Audio 8MB450-4 8" Midbass Woofer 4 Ohm
It had a frequency response of 70 to 6,500 Hz
The more expensive one, PRV Audio 8MR500-NDY-4 8" Neodymium Midrange Woofer 4 Ohm, had a Frequency response of 95 to 9,000 Hz
My amp has a tweeter so the high end frequency was not a consideration.
I wanted more low end.
The third option look great but was rated at 130 watts (I needed 250 )
Thanks again you guys.

You wisely chose the least expensive option, which is likely exactly what Fishman's engineers did many years ago (speaking as an EE :~).

Jon,
Don't you mean Hughs & Kettner's engineers?

The OP's amp was an H&K Era 1.

HE

Oops, oh yeah.