so to continue this discussion,
I had ordered x2 w7dc from K&K MFG.
Their website showed W7DC's available so i ordered 2 to complete a set (I had 4)
what showed up were W R 7DC+. I called and talked to Steve the sales guy, he said he had to check on this and get back to me.
turns out Bosh had substituted the WR's and that was all they had on the shelf. They didn't even realize it.
on top of that before he called me back he said he talked to their supplier and they said the "R" doesn't make a difference.
i had to explain to him how the resistance affects the traditional ignition system and that they should at least update their website to reflect that they only carry the "new" plug.
in the end i will get a refund on the 2 he sent me and i have already found more of the correct W7DC 7500's.
lesson learned to call first before ordering
