The 36 indicates a 36mm pitch diameter, which is Italian threading. If you're considering a JIS taper spindle, why not go with a Shimano UN54 cartidge bottom bracket? They're reasonably priced at $20-$25, are maintenance free and are available in Italian threading.

Mixing cranks and spindles and trying to figure out what will work can be a trying experience, especially if you're changing tapers and going from assymetrical to symetrical spindles. Often it's trial error. Personally I'd take the drive side crankarm and current BB down to the LBS. Try the crank on a various bottom brackets and select the one that duplicates the spacing from the inside face of the crankarm to the outside face of the fixed cup. You may pay a little more at the LBS, but at least you'll have the piece of mind that it is going to be very close to the current setup. If not, they'll probably at least be more receptive to an exchange than a mail order house and if you do have to exchange a mail order part, the return shipping will eat up any savings.