I have the following choices for a set of 15x8 welds draglites- 3.5 or 4.5bs. what would be better? I am open to spacers if needed, and plan to run 275 50 15 in the rear. I'm afraid the 3.5 bs may stick out too far beyond the fender lip, and also wonder what size spacer I may need if i go with the 4.5 bs. any input would be appreciated. thanks