you need to use the brass bars for the front only. the bolts go on the rear. you have to squeeze your hand (hope it's small) between the gas tank and the frame and insert the bolt and washer into that hole. Look on the passenger side to see what you are dealing with. I couldn't figure it out at first either and called them. We figured it out together. I also have the Dcab short bed.
Those were the worst install directions I have ever seen and I've lifted and lowered many cars/trucks and also installed their bull bar with no problems.