I wired up a Mercury Magnetics 10 henry MC10H into my SL-X, but have not drilled any holes in the chassis yet. I would like to pick up the 3 henry MAR100-C Mercury choke as well to compare, so I am wondering if these two chokes are the same size and have the same mounting configuration and center to center holes span? I wired in the 10 henry choke and just wanted to make sure there was not going to be any noise issues with it in front of my power transformer. So far, I can not hear any added noise/hum or interference coming through the amp/speaker. But I am hearing a very slight high frequency wining noise from the choke itself that changes frequency/higher as I move it closer to the power transformer.