Cop Wheels / Rallye Centers???

I've got a set of 15X7" cop wheels, and some generic stainless trim rings that fit from the outside to the valve stem. Also have some REALLY COOL custom made Stainless steel 2.5" high early barracuda lug nuts, and for the crowning touch, I want to use LBP Rallye centers. With the rims painted to match the ragtop's bright red body, and the dark grey centers, I think they'll look mighty fine.

What I'm trying to find out before I drop a bunch of money in the mail, is will the rallye centers fit the cop wheels. I haven't found an outside diameter measurement for the centers, and that's the critical part of the fitment. Oh. the cop wheels only have three holes in between the lug holes, instead of five. But I have a drillpress, so - N.P.!!!

I've found three possible sources:

http://cgi.ebay.com/ebaymotors/ws/e...o=CRX&its=S%2BI%2BSS&itu=ISS%2BUCI%2BSI&otn=4

http://www.wheelvintiques.com/pdfs/56-61_access_pt2.pdf (7 rows from the bottom of the page)

http://www.specialtywheelsltd.org/center-caps.html (third row from the top)

Does anyone have THE answer, the outside measurement of the Rallye centers, and any experience with these dealers or these wheel centers???

Thanks!