Now I know, your all gonna say I should search the forums for the info I'm looking for. But I have, and a few facts a fuzzy to me..

I have a 97 EX Coupe, I'm looking to swap out the rear brakes for a disc set-up. I know I need the Rear Trailing Arms w/ disc & calipers, and e-brake cables from either a 94+ teg, or a 99-00 si. and the prop valve out of a 90+teg.. the ones marked 4040.. where im confused is the need to actually swap out the MC and the BB..
ive seen/heard it said that becuase its an EX i dont need to upgrade the MC or bb..
Do I need to swap the MC? the BB, Both?

I'm not worried to much abotu the difficulty. If it means the difference between a real mushy to the floor pedal and one that isnt. I'll do it.. but i wasnt/ am not sure if they're the same or of comperably size.
any input from anyone with this current setup or experience putting one in would be great. Thanks.

Also if theres anything im missing from that shopping list, feel free, to tell me..