Window Felt Kit: 69-72 Pontiac GPPontiac Grand Prix Window Felt Kit: 69 72. Full inner and outer window felt kit for the 69 72 Pontiac GP.. 8 Piece kit. ? Repops or Montco as they are also known make these anti rattle kits, sweepers, cat whiskers or fuzzies as they are also known. This kit keeps windows from rattling by holding them more firmly in place and stops water from leaking into doors when windows are rolled up and down. All Repops products including their felt kits are