55.2-59 wheel well gasket

[Kevin_C]

so my truck didn't come with wheel wells. I was able to source a pair but noticed the firewall edge had staples through the metal. I'm assuming there was some sort of gasket from the factory. what are people using these days and how much of the far edge is covered? the far edge has a lot of cut outs so I'm having a hard time picturing how the gasket would sit.