I was looking around for the same thing and found them at:
http://www.jayracing.com/products.htm
it is the second item down the list. The price is 125.00
Here is the info from the site:
Jay Racing Alternator relocation kit - Stock Water Pump
This product is designed to relocate the alternator on a 1G DSM to the firewall side of the block. The kit includes the proper size belt, modified tensioner, and all hardware. This kit retains the use of the stock water pump and runs off of the outer most ribs of the crank pulley.
For use on 1G DSMs using the stock water pump
Price: $125.00 USD