black max valves, good?

thanks for the info, the black max valves were on ebay, 4 3/8" valves for $120 shipped, but someone already bought them. so i got these instead: 4 1/2" valves for $132 shipped. http://cgi.ebay.com/4-BRAND-NEW-VALVES-AIR-RIDE-SUSPENSION-1-2-PORT_W0QQitemZ8024681158QQcategoryZ33586QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

fbi has the buy 1 get 1 free deal id go with them