i took my steering column totally apart last summer with the help of a friend who is an expert at rebuilding GM steering columns. it takes a couple of special tools to do it right, but is not too bad. it should be a common part for that year of GM column. mine is a 90 and i believe they stayed with gm columns for these years...
Take the part to a Chevy/GMC truck dealer. Tell them to check it against a 1989 or 1990 GMC pickup. I know the dimmer switch from the 1990 GMC pickup is a perfect replacement for my 1992 Newell.
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Michael and Georgia Day
1992 Newell 43.5' #281
8V92 DDEC-2, HT740
PT Cruiser GT with Remco Transmission Pump https://newellowner.com/newell-photos/