Couple Questions on brake cables and seats.

#1
I need a brake cable. I seem to need one that has a rod on the wheel side of the cable that goes through the brake pin shaft and can be turned by hand. It has a hand turn nut on the the threaded rod. I can't seem to identify what i need including BMI and some other sites. Can you link me to what I need. Also I found a seat to fit my Scat cat on BMI. It hes a bracket under the seat that mounts to a mount on myl bike. Is that metal bracket under the seat a pretty standard size. Thanks for the help. Metty
 
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