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Re: runner to plenum bolts on a superam (DBLAZER4)
"Blazer":
More specifically, I believe you need some 1/4-28 x 1/2 long machine screws. Head design best is either socket head cap screws or button head design. 5/8 length even better than 1/2" but possibly not available. (length is measured FROM underside of head!
For larger quantities/stainless fasteners I've dealt with Material Search Co(Internet address?) in Pa. phone 724-452-8003. Good service and web site