If anyone is interested, I have an AMI PIA for sale - 1977 date code, but looks good (straight AMI logo vs L shaped AMI logo, but the L shaped logos are extremely hard to find!)
http://www.ebay.com.au/itm/AMI-S6820P-PIA-for-Apple-1-6820-PIA-/182346852793?hash=item2a74b829b9:g:cbAAAOSwB09YIU3I
Cheers,
Dean