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Bottom bracket replacement

Hello, I have a bike with CDN gates belt and alfine 11 gear hub. I had to replace bottom bracket twice during 5000km is that normal? It uses BSA 68-120mm thun zumba jis:

https://www.google.com/search?q=BB+THUN+ZUMBA+GBL+440+BSA+JIS+Urban&rlz=...

which is really not standard and I am struggling to find some quality alternative to this.

Can you suggest me something? Money is no object:)) bun not much more than 100-150 USD:))

Also can this be fixed with something more standard like 68-118 and use some washers or something?

Thanks.

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