440-6 pack hormonic balancer

[1973_Challenger]

I pulled my 6 pack balancer off and found a hair line crack on the seal side above the keyway. I contacted cnc-motorsports and they indicated this balancer would work. What do you guys think? I would appreciate the input.

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=8031603125&sspagename=ADME%3AB%3AAAQ%3AUS%3A1

[Chryco Psycho]

there should be more than 2 weights to cover all applications the 6 pack had a lighter balance then the 400 or 440 cast
 Mopar has billet SFI dampers weighted for the 6 pack FYI