Has anyone identified a high quality supplier of tripod boots, or for that matter, a low-cost boot?

30 years ago I put dune buggy silicone boots on my FSV axles and they are perfect to this day.

I've had the Van Diemen for 16 years and now need a third set of boots - and I wouldn't mind paying the prices if the dam things would last. The last set cracked within a year and I've been crutching them with various kinds of goop ever since, but recent suspension work moved them too much and now I have holes!

I'm considering cutting the rubber out of my current set, rolling the edge of the flange to aid in retention, and just putting these in place:
https://www.ebay.com/itm/Universal-H...-/222324759468

For christ sakes the stuff in the dune buggy stores are as low as $4 each!