I have the yellow pad brush that is shown in one of your links. While you can use an old toothbrush (and I have before) the one made for pads does work
much better. I don't think I'd place a special order just for *that* brush, but the next time you order some stuff throw that into your cart. If you order the brush (or spur) you might want to try some
pad cleaner also.
I haven't tried the spur, so I'm interested to see what someone thinks who has used both the pad brush and the spur.