In the German forums, most prefer the byshulz seat posts.
You could have done both with one of these:
The D.2 ST-Ri lowerable parallelogram seatpost offers 30 mm of travel, a stepless lowering function and an ergonomic operating lever.
byschulz.com
Whilst not on a SuperDelite but an R&M with MIK & light mounted at handlebar i opted for a (slightly)

cheaper option:
Front (A$16.29):
Smarter Shopping, Better Living! Aliexpress.com
www.aliexpress.com
Rear: (A$21.66):
Smarter Shopping, Better Living! Aliexpress.com
www.aliexpress.com