One piece of un-asked for advice: before you mount the tire, press down on the valve from the top hard with your thumb to seat it and tighten the nut at the same time. Then carefully tighten the nut another quarter turn with a pair of pliers. Personally, I don't worry too much about matching the taper of the valve to the hole in rim. I've used cheap generics from Amazon for the past two years on various road/gravel/mountain rims without issue.