I checked around in my "junk box." I've got four new Champion CH77 glow-plugs and four new Delco 9Gs. You can't use the 9Gs, but the CH77s are fine.
I checked the specs and the Champion CH77s should be fine for your 6.9. If you want them, pay the postage and I can stick them in the mail.
To be honest though, the Beru plugs that Ford sells are much better quality and are pretty-much burn-out proof. That's what GM sticks in Delco boxes also.
I suggest you hook power to each plug though an amp-meter- just for a second and check amp draw on each plug. That will tell you if bad or not. Your plugs are rated 9 amps.
Ford-IH up through 1986 takes plugs with these stats. If you were using Delphi brand, your truck takes a HDS305. Made for a "12 volt system", plug marked "6 volts", operating voltage is 9 volts, draws 9 amps, takes 50 seconds to reach full heat at 6 volts, threads are 10 mm X 1, heater-element depth is 26.5 mm.
HDS305 12 6 9 <50 @ 6V <50 @ 6V .375" 10 x 1.00 80 mm total length, 26.5 mm depth
The Champion CH77 is built to the following specs:
HDS306 12 6 9 <50 @ 6V <50 @ 6V .375" 10 x 1.00 77.5 mm total, length depth 26.5 mm depth
They are exactly the same except the Champion stands out a little taller by 2.5 MM (3/32"). The installed depth of the heating element is actually the same length.
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