Just to clarify, I am not looking to change to a double crank yet, just the crank arms on my existing triple crank. I understand I will need to change my rear cassette, FD and crankset in order to go to a double crank. Left shifter should still work afaik, as long as I set the limit screw to prevent it shifting to a non-existent third ring.

to answer the previous question, the FSA crank I have the chance to buy does not include the BB, just the crank. My current BB is a Shimano tiagra 1.37x24 road BB. From what I understand, the FSA K Light crank will fit on a hollowtech ii compatible BB. My question is whether those FSA crank arms will fit on my existing chain rings and BB.