Oh you know what, I just remembered that the Wolverine site does not offer the 54", but you can order them from here: http://shop.wingtip.com/product/400029?size=188 Or, in the past I have submitted a request on Wolverine.com for 54" laces and they sent them for free! Not sure if they still will.
I find IRs to be very narrow, with their "EE"Basically a D, so that might be right. At the same time Bakers suggested a D width for me which was a bit too narrow. So it's hard to know. I'd ask for a try on boot before ordering.