Possibly more likely to be real Honda ones,

David Silver Spares, genuine spares, MC28;

NSR250R MC28 : Engine gasket set (RR) .... £35.00

They (Dave Silvers) are well known amongst us 400 boys for being a load cheaper than Honda (i.e. about 1/2 price for RVF bodywork), some good prices here, i.e. R5K seat panels £20, real Honda screens £59 etc.
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Please do not PM me technical questions, if you can't find it on the Forum start a thread