Low profile "race" seat conundrum with rear spare wheel rack

Ok, I want a new seat but it has to meet 3 specific criteria.
1. Low profile, like the ancillotti "race" seats
2. Has to be a flip up.
3. Has to fit with my spare wheel rack.
So, Im looking at something like these
http://www.ebay.co.uk/itm/Lambretta-Rac ... SwTuJYpZ7x
But the below picture shows you what I am up against on my scooter
IMG_0960 by Donnie Canning, on Flickr
Anyone else got a similar setup and pictures to give me an idea?
1. Low profile, like the ancillotti "race" seats
2. Has to be a flip up.
3. Has to fit with my spare wheel rack.
So, Im looking at something like these
http://www.ebay.co.uk/itm/Lambretta-Rac ... SwTuJYpZ7x
But the below picture shows you what I am up against on my scooter

Anyone else got a similar setup and pictures to give me an idea?