Akai S1000 / S1100 samplers

Hi everybody ;)
I'm the one who was undecided between buying a s1100 or a s3000xl some 
time ago (some posts ago ;). Now I'm very very happy with my "new" 
(used) S3000XL! Thanks for your suggestions.
Now I'd like to ask.. Does anybody know where I can find the flash rom 
expansion (model FMX008)? It is really hard to find. I've found another 
one, not the original, from MUTEC and it costs around 100 EUR..Could I 
have some problems using this one instead of the original from AKAI?
Any experience?

THANK YOU!

Bye from Venice :)

Stefano