To correct a bit of what I typed up there if the base plate touches the Spark Plug and there's not much tension I wouldn't worry about that. The trim ring on the far end of it where the seal get's installed might not be clearing your radiator hose but if it is not applying too much tension on...
Really? There are a few producers for it and most likely it can be just perhaps a mistake on your end or the reproduction companies it happens and it is normal. Try and centre the trim ring within the wing nut square opening and check to see if that trim ring sits on anything like the Ignition...