Autolite Fine Wire Plugs

Ever since kart racing days, I've been partial to fine wire spark plugs because of their ability to resist fouling. Needing some new plugs for my stock '71 Roadster, I went looking for some NGK BPR7EIX which were mentioned on this board. I couldn't find them, but I did find and pick up some Autolite XP63's, which cross-references to the BPR7EIX. Then I discovered Autolite lists an XS62 specifically for CDO's. I called Autolite to find out the difference, and was told the the only difference is that the XP63's are a little hotter and "might be too hot". Has anybody here had experience with either of these Autolites? Is there enough difference in heat range between these two to worry about? I don't have any current fouling problems and don't expect to be flailing the bike - just looking to be bulletproof.

"Carry on and dread nought"

They look to be the same.

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These are a couple good plug threads. I think Autolite's conversion charts might be a little vague. I ran a set of AP64's that were way too hot. The AP63's are a cooler plug but they didn't look that much different. I'd want to bracket it with a 62 and see. If you're into karting then you know about reading plugs, but there are a couple good links.

NGK # IGR7A-G Lazer Iridium is NGK's iridium wire/platinum pad plug in the 7 heat range. NGK #3106