I've had hundreds of pole position boardsets and have never seen a NAMCO version. I know they exist as the manual talks about them. I'm just saying, they must have only been used in overseas poles or something. Or I would think I would have stumbled on one in the last 25 years.
Good luck! Hope you find them!
John
The Namco boards were more popular in Canada
because I "believe" Atari did not have exclusive rights in Canada
like they did in the States, so some games came directly from Namco/Europe.
Of course most PP's in Canada were Atari versions from the States,
but there were Namco versions too.
I've personally had two full Namco sets .
I even had a Namco cab..
(see this crude write-up I did many years back
http://www.arcade.chezsuys.com/PP2Cabs.html )
Unfortunately, neither boardset worked, so I sold them to John Robertson at
http://www.flippers.com/ (in Vancouver Canada)
I know John fixed them, but I don't know if he stills has them
(...might be worth an E-mail to him ...).
Other than a few back-ground difference in gameplay between the Atari and Namco version,
the biggest difference is that the Namco board has the sound Amp right on the
main PCB, so the AR/IIs are not really needed. (see pics)
You can use a standard switching power supply and eliminate the AR/II's altogether.
(see pics of AR boards which are practically bare except for the +5V and +12V )
Also worth noting, the wiring harness is very different
as the boards have different finger-board connectors
(ie. you can NOT plug a Namco board in an "Atari" cab , ..and versa )
Cheers,
Steph