There are more than 200 SNPs for these genes. It depends on what you want to study. You can see in the PharmaGB database, the correlation of each SNP with drugs, so you can eliminate the number. I use this database and every time I choose the optimum number of polymorphisms for my experiments.
I have some publications on this. If you let me know which SNPs you are interested in I might be able to help you on this. Please have a look at my publications and let me know the ones that you are interested in.