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go out and get a long, T handle allen wrench to install the runner bolts. works like a charm and well worth it. Runner bolts are easy, be sure to place the correct runner on the correct side. They are different even if they both bolt up to either side. Don't ask me how i know...The plenum bolts are the pain.
And if they send you two of the same side, you'll never even realize they're SUPPOSED to be different until it's all together and leaking like a sieve.
I too had the center bolts threaded from the top - makes life a LOT easier.
[RICHR]