The upper to lower section on 2J is level. I think 5Ks are angled, so no I don't think so
If you are looking for a 2J upper, I reckon your only open is to repair what you've got or buy from Japan.
If you've a damaged upper Alkamoto should be able to sort it out
I've bought a few 2J upper fairings from Japan using Japan Auction Center, and they always arrived intact. Probably won't be cheap though. A clean one could cost £250 + VAT + shipping. Everything I've bought recently over £18 seems to get VAT. It used to be random
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