I was going to make my MC21 Track Bike into a Cadalora 1991 Replica, I even sourced a pair of 21SE forks with dark coloured stantions and a RWU NF5 Tripple Clamp / Yoke set. But after buying the NX5, that is now going to be the 'Cadalora Project'. Must admit though, I do like those 'proper' green numberplates on the 91 works NSR.

91 was the last year that each GP class had to run the individual class plate colours.

GP125 - Black. GP250 - Green. GP500 - Yellow.

So in 1992, Cadalora's works NSR250 Cadalora went to Yellow Plates, which still looked OK and matched the 500s. But for me the HB liveried NSRs (Bradl / Romboni) never looked anywhere near as good after dropping the green plates.
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Rich
MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA 'Aoyama' / RS500 / Two Brothers Racing RC30