Harland sharp rocker arm spacers/shims??

Just bought a set of harland sharp rocker arms. Noticed that it doesn't come with any spacers/shims to align the rockers. Tried to call them today but they close at 11am, so I was wondering if anybody knows what measurements I need to take to order the spacers and shims, and also how much clearance there should be between the spacer and rocker arm body itself(if any). Ill call them again on Monday, but just figured someone on here probably knows the answer so thought I'd give it a shot. Thanks