Is the height dim total height or cam surface to valve stem operating height? I'd be less concerned with overall height as long as it doesn't bind or come out of the head. Would be more concerned with operating height.

You had said the the lifter ( lash adjuster ) separates from the bucket. Is the lifter a stand alone unit or just the plunger? Lifters are made to a very tight tolerance then match fit for proper bleed down rate, mixing might cause problems if the lifter isn't stand alone.