Ken and Ron
Yes they have them the part number is P-102. However they only start at the year 1980, so you are both covered. The number is the same for both.
If you want I can check with them as they had to order mine for the 420 because it is a canister type also and did not have it on the shelf. Took two or three days to come in. Thats why I ordered three to last awhile.
1989 420SEL 105575 miles
1990 Chevrolet E-Cab C-1500
1989 Olds Toranado Trofeo'