I've never seen a stock pair of K's like that. The ones I've seen have always been off to the sides, doesn't mean they didn't make any like that, but that's the first set I've seen.
BTW--Kev, the mid drivers have a metric 6 by 1.0 thread in them. So you need 8- 1" long 6 X 1.0 metric bolts. Got mine at Home Depot....they're just a shade bigger than a 1/4" bolt..