I ended up with bluelines in the MKU's and a K7 in the MK, the reason i stayed with the K7 was because it was dark, rolled off and thicker sounding and is exclusively for kick or bass cab, it sucks on vox and about anything else, but thats ok because it makes 5k down super weighty, i'm going to change the polar pattern to supercardioid pretty quick here to more resemble a 47fet pickup, i also used some brown bean vishays for metal films, NOS beyschlag for carbon resistors, the tranny's are IOaudio's, and I used some hybrid poly/paper in oil coupling and non styroflex polystyrene bypass caps in the mic and supply. The swapping/listening testing of parts is fun to me, and the combinations are almost limitless, so if you have the time and compulsion to do this, i'd suggest keeping a log of the changes you hear over a number of days of living with specific set ups as they can be pretty subtle, then move on and reference back, it's pretty fun and the end results can be totally rewarding. I've done the same with a C12 that is just amazing sounding to me, I've also collected a ton of NOS for my elam pair, including original haufe's, beyschlags, wet tants and a pair of NOS perfect measured and matched 1953 GE 5* red inks, i'll use TC12's in these, i'm super excited about the forthcoming 251's!
