They can be found on eBay. Probably ship from UK. There are also China knock-offs - not much cheaper. Some have used a transmission funnel, but this cone is cheap enough and seems rugged and designed for the job.

Pneumatic looks best, but the cone may be better if trying to change boots without disconnecting axle from diff. ??

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Graham
85 300D,72 350SL, 98 E320, Outback 2.5