Oem Spark Plugs ???????

I have a 93 3.1 V-6 in a 1993 Lumina. Were the OEM spark plugs the A/C Platinum????
If not does anyone know what were the OEM plugs.
I put a set of Bosch Platinum plugs in 20,000 mile ago & they are not looking real good. I have read that a Chevy that came with A/C DELCO Platinum plugs don't do good with Bosch.
Any input????

In 93 they did not come with plats, but you can use the Delco plats now, and correct the the Bosch plugs don't hold up in these engines.