I already gave you the correct numbers for just about every brand of plug that goes to your 6.9.
The brand of the plug won't make a bit of difference in actual starting - except - dual-coil self-regulating plugs are basically burn-out proof, while many other's are not.
I agree with Bob that there isn't any better out there than the dual-coil Beru plugs. That being said, the single-coil Berus will burn up just as fast as an Autolite, Champion, Delco, etc. Bosch, Wellman, Delphi, etc. all sell dual-coil plugs now that hold up just as well as the Berus. If you buy new plugs today from Ford or GM - you get Beru dual-coil plugs. It may cost a few bucks more that way - but sometimes it's easier going to Ford if you need them in a hurry.
As I said before - if you want to be sure - you need to check with an ammeter - one by one with each glow plug. It's easy to do and takes little time - and saves a lot of guess work. I already gave you all the test specs.
In regard to what Alan said about the 6.9s being tough starters? Maybe somewhere - but not with any of mine. My 85 6.9 and my 94 7.3 are both excellent cold-weather starters. Same with my Isuzus and my Dodge-Cummins. Only bad starters I've ever had are my GM 6.2 diesels. The best of the lot is awful - and the worst id more awful. My 1985 with the 6.9 can sit for two months - and then I go out and try to start if at zero degrees with no block heat - and after 15 seconds of glow-plugging it starts right up. With my 6.2s? At zero - you can more-or-less forget it unless you've got the block heater plugged in. And at 45 degrees F above? They still need a good 10-14 seconds of glow-plugging. My 85 6.9 currently has Motorcraft ZD1A plugs - Ford # E5TZ12A342B - which came as either Bosch or Beru years back and now are usually only dual-coil Beru.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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