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Like Sham said above, they come in different sizes. The D8C is the 8x3 (same size as the Norton stones) so yes, it will work fine for them.

I understand using the 1k W/D sandpaper, as I did the...

Just from what I can tell, it shouldn't be a problem. Yeah, it leaves the 8k a tad rough, but it glazes over pretty quick too.

I just hate the Norton lapping stone cause it dishes out as well :(...