[NTLK] Keyspan USB question

I'm looking at a couple Keyspan adaptors on eBay right now and
noticed a couple differences in case styles and slight model number
difference:
Keyspan USB Twin Serial Adapter USA-28
http://cgi.ebay.com/Keyspan-USB-Twin-Serial-Adapter-USA-28-Mac-4-
Shipping_W0QQitemZ290014093016QQihZ019QQcategoryZ25436QQrdZ1QQcmdZViewIt
em
http://cgi.ebay.com/KEYSPAN-USB-Twin-Serial-Adapter-Apple-Macintosh-
USA-28_W0QQitemZ260016363334QQihZ016QQcategoryZ25436QQrdZ1QQcmdZViewItem
and
KEYSPAN USB Twin Serial Adapter USA-28X
http://cgi.ebay.com/KEYSPAN-USB-Twin-Serial-Adapter-USA-28X-Apple-
Macintosh_W0QQitemZ260016235719QQihZ016QQcategoryZ25436QQrdZ1QQcmdZViewI
tem
Does it matter which one I try to get? I don't want to mess up on
bidding and not get the right equipment. (can't afford to do that)
And I'm assuming that I can still get drivers that will allow this to
work with Tiger on my Macintosh. I think I saw a link for drivers
that allow syncing a 2100 with Newt Sync.
Thanks all!

Fred

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