So I'm redoing all the worn out front end parts on my 91 wagon 4WD. While browsing around looking for front end wheel bearings, I see some with the built in dust shield and some without. Does it matter? Or should I spring the extra few cents? Would I still need the Wherl seals? I've only ever replaced rear bearings and never front ones. I know how, just dont want to mess up and have to redo it.