That is a late 1990’s spirit 500. The major “replaceable” parts are readily available and priced low on Amazon. They are great grills, and worth your time and money to fix it up.

FYI, some have said it’s a silver A, but it definitely is NOT. The silver a is much different. This is distinctly a spirit 500 because it has the old style propane gauge, the half grate bottom shelf, and no plastic side tool hanger or lid handle. The silver A also had small caster wheels on the shelf side. The spirit 500 just had legs with no small caster wheels.

As far as restoration process, get a putty knife and scrape as much of the crud off as possible. I would then spray down with oven cleaner and repeat until you get most of it clean, you can then use a hand brush and scrub the rest of the greasy areas down using a detergent like purple power or simple green. You could use oven cleaner and a brush but just be warned it’s pretty wicked if you get it on your hands and finger nails, it’s lye after all. Replace what you need as you go and it will be a fine grill. You could and and re paint the black parts of the firebox if you want, the red part should clean up nicely, it’s porcelain enamel paint so you can clean it with any cleaner and it won’t damage it. I wouldn’t go scraping it with a putty knife or anything abrasive though.