Solis tek ballast plug pattern?

Can someone tell me what the pattern is on a solis tek ballast socket? I've been looking all over and can't get a clear look at it. I am replacing my 1000w magnetic and want to keep my existing fox farm reflector. Will this adapter work?
http://www.growwurks.com/ballast-receptacle-adapter-sunlight-ballast-to-hydrofarm-reflector.aspx