You didnt look very hard at all. Dont worry, Ill spoon feed you!
http://forums.hybridz.org/index.php/topic/101735-z32-transmission-adapter-kits-for-l28/
There is a link to the original thread there and there is another guy who did this as well and wrote a writeup. Between the two threads you get all the answers you need.
I contacted mazworx and they said they have one sitting on thier shelf. Call and you shall recieve it. They will even machine your bellhousing too.
Heres the email from them,
Tech Dept tech@mazworx.com
Jan 23 (2 days ago)
to sales, me
Yes we have it on the shelf. Forwarding this email to our sales dept and they will give you a price on it. Thanks From: marcus mcevoy [mailto:akeboshi11619@gmail.com]
Sent: Sunday, January 22, 2012 12:22 AM
To: tech@mazworx.com
Subject: Z32 trans to L28 engine adapter Hello,I briefly browsed your website looking for the z32 trans to l28 engine adapter braket but didnt see it. Do you guys still make this? If so how much?Marcus