I *somehow* lost 2 feet on my TD-9 rack (MDS-9), must have been while moving it from the car to the home. I didn't notice until the next day when I rebuilt my drums, and consequently I never found them. I think the local birds decided to eat them during the night. Anyway, these feet fit standard 38mm rack pipes just fine, so they did their job, and at a reasonable price.
Over the past few years I have built up a whole stack of Gibraltar Rack equipment from Thomann - so sturdy and versatile - for me it's just ideal and very keenly priced. The rubber cups are extremely strong and stable and pretty heavy duty - and are ideal for extension pipes etc. Would ceratinly recommend these.