Dan,
Sorry I haven't replied sooner! Thank you again for the offer, but I may order some as I am looking at building the Dinotte style light with a Cree MC-E, and if so, will order from DX since I do think I found it! Check this out:
Flood Lens
I haven't taken the time to get my calipers and double check the measurement, but it looks like that is it for anyone else looking to get the flood lens.
Chris