Bluemels .... that brings up memories ...
The SKS mudguards are originally made by ESGE ... they were the big competitor to Bluemels and later Zefal ...
Bluemels went under first if I remeber right... than ESGE ... than SKS bought Zefal ( at least I think they did at the time )
SKS now made the Esge fenders and dropped Zefal again
Bike biz is sometimes a little strange to say at least

anyhow
get some sks for Dahons ( I am actually out at this time )

they mighrt not be perfect ... but with an extra set of V stays ( cut from a bigger bike ) you will be able to make a custom fit

Thor