Not to sound needy... But if you're going to have it where the lower mounting tab of the upper coil is cut off, why not add a second mount for the lower coil to bolt up to? Wouldn't that allow for a slightly more secure fit, as it would secure both ends of the lower coil and allow the lower coil to act as an anchor (of sorts) for the lower tab of the upper coil to rest against?
(I'm envisioning cutting the upper coils tab in an arc so that it will rest flush against the lower coil)
Sorry for more potential work, just thinking out loud here and I figure if you're making it fool proof, might as well go overboard
