Aaand I snagged track 7. The link to the page was gone on current 5pb.Records page, so I used Wayback Machine to visit the site circa Feb 2013 and found the banner for "Scorpion" I needed, which was this access page:
http://5pb.jp/records/sp/corpseparty/index.php
Track 7 is a 192k cbr mp3, 48 kHz, track length 22:40. id3 tags show the artist as 岡本信彦, and (fun fact) it was encoded using iTunes 10.7