The problem is, suppliers are not stocking things like drums, heavy duty axle tubes, etc... Not enough demand and they don't want to make runs of parts that they will have to pay for up front that will sit on their shelves for long periods of time. This isn't the 1990s when there were 40 swingers showing up at La Rana or Fuds and 50+ showing up at SCORE/HDRA races. As far as I know, right now, there are no aluminum centered drums available retail. Same with race axles. Trans guy spent a couple weeks sourcing tubing in right dimensions to do some heavy axle tubes recently. Plenty of bent axles available, though.