G81-1800 HPU for 50 USD each. They have a stock of 10.http://cgi.ebay.com/CHERRY-MY1800-KEYBO ... 3a63669605
This was why in my beige/white double shot kit we decided to add a right shift as well, because maybe not everyone sourced their white/beige double shots from Sixty :X
If you do get this keyboard, the numpad won't really work well on a full sized keyboard with numpad, because the 0 and enter keys are small for starters.
My kit doesn't compensate for the numpad, we hoped people sourced from Sixty if they wanted it for a full sized keyboard with numpad.