Beside the question, if you need a new Flash chip or not, I´d like to point at the fact that everything is onlyne at Adaptecs page! A little bit tricky to find, but great support. Just go to "obsolete products" at supportpage and scroll down to "SCSI for Macintosh"

http://www.adaptec.com/en-US/support/_eol

Even in other languages, etc. availaible. Adaptec is a good company and I have to regret no single cent they got from me in the early 2ks - especially as they owned Toast