Hi Mick,
last year I re-did my front seats, standard bucket in white. I bought the new foam and new upholstery covers from Sydney Mustang parts, they are not Scott Drake but the quality seems really good.
I don't recall the brand at the moment, I can double check for you if you want.
Regarding pony trim/foam I'm not too sure if they fit the standard frame, I believe they fit but you need to double check with someone else.