New to me B&S #2 surface grinder many questions

[Alcap]

Decided on simply use a link V belt and skip figuring out a belt tensioner for the motor . I did make up some rubber insulators out of an old tire ( race car i believe). Made a guard from some sheet metal I had laying around . Did make dresser from a 2x2x1 block .

 

[Alcap]

How do I determine what wheel arbor to get ? I did a search “ Brown &Sharp #2 surface grinder arbor” and other searches but wasn’t able to fine one that I was positive on . Any suggestions? I would like to get a few arbors along with a variety of wheels then make a wheel balancer . Thanks Al