You can get any good saddle shop to alter the rigging for you.
I fourth(?) the mohair cinch idea. My thin skinned arab galled with a fleece girth, and a felt girth, I finally bought a very expensive hospital felt girth guaranteed not to gall, and it was the worst. Finally had a saddle shop change the rigging to western, bought a really good quality mohair, and I couldn't be happier. No galls since.
I agree whole heartedly with smrobs comments about the type as well. Straight with no leather bit. I'm 100% sold on these cinches. They last forever too. Bork & Sons Cinchas