yep, that ladder without the curve, is designed for running without the spare. There are only 4 or 5 of those ever shipped as far as I know. If you bought it used, try and sell it and get the proper ladder. There are a couple guys that I'm sure would buy it. I'll even help you out on shipping of the new ladder. you can use the new box to ship it safely too.
If you are running a MT in a 35" tire on the stock wheel, you may want to order up spacers at the same time as your new ladder. this will give you just enough room to clear those lugs and also allow for more room to clean back there.
other than that, don;t overtorque the stainless hardware, use some anti-seeze if the hardware is stainelss to stainless. if you have the nylon locking nuts, you're OK and will not need the anti-seeze.
gobi install isntructions are on line if you need them.
hope that helps some. lmk if you need more info.
The wires running through the rack run front to back. hook your rear lights up to those pigtails at the rear. now they are stubbed out the front and ready to run down your apillars. get some weatherpack connectors for up front and mark them for each set of lights. if you ever take teh rack off for some reason, your wires are easy to unplug and re-connect when your done.