I have a 603 OM so I don't have to adjust it's valves, nonetheless I've been keeping an eyeout for all things 123/61X and I saw these auctioned buy Samstag and wondered if they would also do the job?! They are 14MM but appear to have shorter handles although the handle bend radii look to be nearly the same as the longer handled wrenches? It seems that the asking prices and the selling prices for these shorter wrenches is less than the longer ones, perhaps they would work as well at a lesser price? Should be cheap to add longer handle to these wrenches. As the area of contact between the tool and the work is the most important you'd have a good Hazet wrench head with modified handles fairly cheap! Just a thought and an observation, if anyone has any opinion why they would not be suitable, please?
Good Luck!
oh yeah here's the link too!
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=1848213200
P.S. by the way having done a little business with Samstag I been very well served with very high quality tools quickly delivered!