New bone nut replacement

I’m going to be replacing the nut on my 2016 Mexican Tele since I want to use lighter gauge strings. Does anyone have a specific website they use for bone nuts? I’ve narrowed it down to a cheap option on Sweetwater for about $8, an $18 option on StewMac, and a $12 option on Fenders website. I’ll go with the cheap option unless someone has a preference that I could use.
Also, do I also need to buy nut gauge strings? I plan on filing it down for 9-46 strings.
Thanks 🙏