Pro Gram received the old cap I sent to them, and advised me this morning that they do supply billet caps at $325 for a set of the center three. I am going that route. They verified that their caps are splayed at 16 degrees ( as are the stock caps). Milodon's splayed caps for big blocks are splayed at 10 degrees.
Anyhow, if any of you guys that run Gen VI 572's ever need a main cap, it looks like Pro Gram is your best option. ( Probably the ONLY option, unless you are lucky enough to come across a used stock cap)
Thanks to all who took time to post and try to help. I appreciate it. The end.