Hi, Does anyone know where I can buy one of these for my Omega D5V XL?

421-934 Mount for 150mm APO Componon

I'd like to buy this lens but can't seem to find who sells this mount... Thanks!

what size is it?

check these guys
http://www.khbphotografix.com/

Thanks, their web site has an excellent guide to what lens boards and mounts are needed for the D5V XL including photos which is handy for eBay. This is where I found out which one I need, I just don't know who sells them...