The KL3 works on the 7Z powered by the B65 NiCad.
It's too long for actual use in my opinion though.
The E1e+KL1 is also 'free' light because I power it with my used SF123As.
Thanks for the reply Al, I'm not sure what a 7Z is though. It's looking less likely that I'll opt for the conversion for the 6P based on the excessive length.