I'm not sure if this is the right place to be asking this, so if it's not, please let me know.

I'm trying to help a buddy of mine find a drop-in bed liner for his dad's Custom 1978 F150 and we're not sure if they'd even be available. Does anyone know if getting one would even be possible? He definitely wants to get a liner, but wants to avoid a spray-in if at all possible.

Thanks.