There are two parts to that hood stop, the bumper and the stud, do you need both, or just the rubber bumper?
If you do not want to pay around 21.00 plus shipping total for a new bumper and stud, then you may want to check with local salvage yards.
Use the following to search and at least find a yard with your car, then call to see if they have the part.
Car-Part.com--Used Auto Parts Market
The parts I am talking about are 12/13 in this pic.
Here are links to the parts new.
STUD. Hood Panel Closing for 1997 Oldsmobile 88. #25526456
BUMPER. Hood Panel Closing for 1997 Oldsmobile 88. #14069250
I am not sure what part you are describing.
"slide in on in the fender that holds the hood away from fender."