Try Go Mog for advice viz:-
WIPER BLADE REPLACEMENT
For those of us with a difficult access to a Morgan Agent, you will find the the early Volkswagon Beetle wiper blades work fine with a Morgan. By the way, for the purists, there are two sizes of Morgan wiper blades (regular and four-seater windscreen which is a tiny bit longer.
You can also simply replace the rubber only. Use silicone to glue-in new rubber for the wiper blades. Two dollars gets you new refills for modern wipers- long enough to do three-four Mog blades. The new blades let the rubber do the flopping rather than the whole blade.. and they work a LOT better than original. (keep the new glass clean..).
http://www.gomog.com/allmorgan/screens.htm
