Any advice on this? Mine are in reasonable condition, the foam is all solid and in shape, but the vinyl has various holes drilled in it from previous owners and is a bit faded/miscoloured from time. Was thinking I might be able to just use 3M car wrap or the like to get them looking good again?

Maybe you could fill the holes with some sort of product and vinyl spray the pad .

Good idea, I'll look into it. Was thinking of tidying up the rough edges around the holes then filling them with maybe expanding foam or something similar. Then wrapping in 3M wrap, or vinyl spray could be the go to