You can parallel the closes values to make up 14.5uf =/- 10 % so you should be fine.
As for the smaller caps, tweeter caps? find some that are exact values, 3 3.3, 4.7, 5, 5.6uf are common values, do check out the different brands.
As for the smaller caps, tweeter caps? find some that are exact values, 3 3.3, 4.7, 5, 5.6uf are common values, do check out the different brands.