Peanuts cheerleading cels (unidentified)

Recently I have been trying to figure out where this peice of peanuts media is? It’s part of some animation with snoopy on a football field cheerleading with red white and blue Pom poms. there isn’t that much info about this one other than the following:

Drawn by bill Melendez
It was created in the 1980s
Current snoopy cheerleading cel still up to be bought
Maybe an ad for MetLife or a cut part of a tv special 1985 - 1989

I remember 3 or 5 years ago when there was other 2 cels of this scenario. With the peanuts gang in a cheerleading squad, One with the boys Linus, Charlie Brown annd Schroeder about to pick up the girls Lucy, Sally, and peppermint patty with the same red white and blue Pom poms, and another one with the same boys doing a routine while Lucy is in the air doing some splits with her Pom poms.

Besides that, I still can’t find the source for it. Do y’all know the source for the cels?

Here’s the links of the snoopy cheerleading cel:

www.worthpoint.com/worthopedia/vintage-peanuts-animation-cel-138281747

www.ebay.com/itm/373531652651

celfcentered.com/product/peanuts-snoopy-cheer-leading-original-production-cel-on-original-background/