I can't think or see anything Rupert! The B20's were only ordered in 37 & 38. The only thing I can think is that they were using up stocks of the 39 parts on WD Bikes. From memory, I'm sure my WC10 has those same links with corresponding spindles, but the bike came as a basket case, so I don't know if they are the original parts? My WB30 has the 40 pattern links and spindles (with the tapers). Ron??

email (option): ronpier@talk21.com