I wish you had posted this a couple of weeks ago when I was back with my collection!
I know I have a spare Fireball brush in my trade box. I know it is definitely his, as Fireball was one of my childhood ponies and it matches my childhood brush (it's not the same as Trucker/4Speed's shade).
...If you are still looking for these at the end of the month, feel free to send me a PM. I'll be home early June and will be able to send you pictures if you are interested.
Good luck finding the other things. MB accessories are quite scarce but they do come up from time to time. (I still hate that I somehow lost all my childhood MB stickers in a move as a kid :'( They're so expensive now
)