Basic thread is M14 x 1.5 pitch.
You would want to specify "ball seat" or spherical for the OEM wheels. Most aftermarket wheels are "cone seat".
I don't know the length you want, you'd need to understand how "thick" your wheel is at the hub. The knowledge I'm sharing is from my messing with track studs. I'm running a 65mm stud, but that dimension is more or less meaningless to your Q.
I think most folks just pull out one lug, and assuming you're happy with it, you measure the length and buy similar again.







