OEM diode pack can be replaced using general purpose diodes available at Radio Shack or any other electronic component source.
Radio Shack:
http://www.radioshack.com/product/index.jsp?productId=20625781N5402 or # 276-1143
3 amp, 200 v PIV
$1.69 each.
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Need two diodes ( 1N5402 )

and some insulated crimp terminals ( 3 x red ).

Twist together the cathodes ( banded end ) and crimp on an insulated terminal.
Crimp insulated terminals to each of the remain anodes ( Un-banned end )
Looking at wiring diagram below:

The end with the twisted leads into a single insulated terminal connect to the GREEN wire.
The remaining diode ends connect to the GREEN\RED wire and the other wire.