The early Rapid standard and sports seats both lacked lumbar support. The newer Rapid sports seat (2015 on?) is more comfortable but looks utterly sh1t - like a Bentley-lookalike seat cover from Poundland.
I find the newest Toledo seats much more supportive than the 2014 ones in my older car.
I expect
Ibiza seats would fit as well. The ones in our TOCA are comfy.
There have never been full leather seats for Rapid or Toledo, but the Alcantara / Simileather ones are nice, if you can find a breaking I-tech, Style Advanced or Xcellence.
More likely to find an
Ibiza being broken I think.
The Chinese version of the car, the VW New Santana is available with full leather, but getting it here from Ali express might be a little pricey.