The different designs of the Hurst line locks are confusing. Here is a pic I swiped off the internet (possibly this site) some time ago of the style I thought would be correct for Day 2ing my 1970 Nova:
I bought one that was supposed to be a Hurst and looks similar, but isn't quite the same, and it doesn't say Hurst on it. It looks like the one on the right in Hemicolt's pic, so maybe it really is a Hurst?
Hemicolt, does yours say "MASTER CYL." on one end and "12 VOLT D.C." and "WHEEL CYL." on the other end? That's what mine says.
Biondo's current offering is probably similar enough to fool 99+% of the general public:
http://www.biondoracing.com/RacerEssentials.shtml#LL