I think it's just a mistake in the 'picking and packing department'. Just a little disappointing as I'd had an email exchange with the parts guy prior to my order, who said he sort it and make sure I got the right thing.....

"Y mae dafad ddu ym mhob praidd"
1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10