Polo Bikes

They are gold/silver in colour with a R code. Long pull are black, without the R code.

short pull disc breaks? I didn't know such a thing existed, I thought they were all long pull?

sheldon explains both the long pull with short brakes and vice versa, look at too much/too little mechanical advantage:
http://sheldonbrown.com/rim-brakes.html#ma
basically either get a travel agent (you can fit it in reverse in your case) or disc brakes that are long pull?