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Are all of the lighting up? are all of them flashing?
Are the sockets also off the '91 burb? Check this out: http://www.sylvania.com/ConsumerProducts/AutomotiveLighting/LampReplacementGuide/AutoLRG-Results.htmIt says 3057 in the front and 2057 in the rear. I don't know bulb numbers too well, so I don't know what the difference is really. Might be worth a look.edit: that link didn't work (sorry). Sylvania's website will show a list though if you tell it the make/model/year.