Up for bids is a new genuine side cover knob for the 1972/3 S1/A and 1972/3 S2/A models, Kawasaki part number is 92077-020. I believe this would probably work on the early H1 and H2 models which have a similar knob with a larger diameter; you decide. No longer available to order for many years now. 

PLEASE NOTE THE FOLLOWING:- ORIGINAL PACKAGING AND/OR PARTS LABEL EVEN IF PICTURED MAY NOT BE SUPPLIED. POSTAGE AND ANCILLARY COSTS QUOTED ARE AN ESTIMATE ONLY, ACTUAL POSTAGE WILL BE CALCULATED AT THE AUCTION END BASED UPON THE LOCATION OF THE WINNING BIDDER. I AIM TO POST WITHIN 5 WORKING DAYS, ALTHOUGH THIS MAY BE LONGER AS I WORK FULL TIME