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Buy bars you can return, pull the old ones off the clamps and put the new ones in. If they are not high enough reclamp the old ones and return and buy the ones you want.
I'm 6' and decided to go with 14s. I have regretted it ever since. The 14s are nice but I would prefer 16s or maybe even 18s. For your height, don't go lower than 16".