I have no interest in these, but if you have been looking for some, there are 5 of them for sale (individually) on eBay:
http://www.ebay.com/itm/NOS-1955-1956-1957-Pontiac-rear-quarter-star-ornament-2-prong-mounting-GM-5-/370680405070?ssPageName=ADME:B:SS:US:1123
etc. through
http://www.ebay.com/itm/NOS-1955-1956-1957-Pontiac-rear-quarter-star-ornament-2-prong-mounting-GM-1-/370680401869?ssPageName=ADME:B:SS:US:1123
you can do a simple search to find the other 3
DAve
1956 Pontiac Pathfinder 2dr sedan, 496 - dyno'd 545 hp, stick shift, 4.11 posi - Hot Rod
1964 Acadian Beaumont SD convert, 283 - factory 195 hp, Powerglide, 3.08 10-bolt - Cruiser
2012 US-built crew cab truck - Daily Driver and Boat Trailering