6v canister style coils. do they exist?

[hueyhoolihan]

i'm probably opening up myself for a lot of speculation here, but here goes. are there still dedicated 6v canister style coils being made?

i'm running a 6v positive grounded ford (1941) and am installing a "coil conversion kit" designed to dispense with the original coil, for use with the "diver's helmet" distributor, such that one can run with the slightly more modern canister style coil that became popular in the late forties and continued on up up until about the 90s.

researching this over the last couple of days, i've ran into just about every combination of yes, no, maybe and it depends...you can imagine. so what's the consensus here:

are there dedicated 6v coils out there for sale, and are there such things as dedicated 6v and 12v coils and if so what makes them so, and do they work with both positive and negatively grounded electrical systems, and here's the kicker...

how are to be hooked up? is the ignition wire running from the ignition switch to the ballast resistor (if there is still one present) attach to the "-" side of the coil or the "+" side of the coil. as i've read everything from it MUST be one or the other to "it doesn't matter". and the number of contradictions appears to be equal as far as i can tell.

of course, i too have my suspicions, but absolutely no solid evidence or even a reasonable explanation on what to base my suspicion, excepting common sense and quite a bit of research on the polarity of the high-tension coil current and the how and why it is created in one direction as opposed to another. and as a result it is questionable, to me, whether the spark created would be equivalent in all respects if hooked up one way as opposed to the other.