hey my names nathan,
i picked up a 79 oldmobile 88 royale from a junk yard for $800! it sat for 2 years prior to me buying it and i turned the key and she fired up right away! this car is a beauty. only problem is the rear bumper is rotten all accross the top. does anyone know what other models of cars would have the same bumper?

I don't know about other models that would share a bumper, but if you want a rust-free bumper, the Arizona Automobile Recycler's Association might be able to help.. They've helped my family get all sorts of parts for the Oldsmobiles we've had over the years: http://www.aara.com

You can request a part, or search their inventory. Given that demand for parts for your year and make/model may be low, you should request a part. If they have it, they'll get back to you within 24 hours. Good luck!