[B-O-B]

I agree on having the builder source the parts. That should something happen he cannot tell you that there is no warranty as he did not get the parts. had that happen when building this house. I was going to buy the plumbing fixtures & the plumber told me he could not warranty them. Sure enough he dropped the double cast iron porcelain sink & chipped it. He had to purchase a new one & it was not very cheap.
You might also to ask your builder if those rods need reconditioned.