The 'aero' style cuved blades are now very popular and IMO a much better design than the traditional multi- frame type. Like anything else, there are good and bad aerofoil blades and some look pretty awful when fitted. The nicest I think are those by Bosch, which have a lower profile arm coupling than many others. I got a pair from eBay and have been very happy with the results:
https://www.ebay.co.uk/sch/i.html?_o...er+75&_sacat=0
Mine are of equal length (22" as I recall).
TC