snells springs in penrose make them to spec, 220 for the last pair i got done.
but you gotta tell them how stiff u want them etc, just ask them to work out what ur standard ones are and add some pd to that
they also like it if you measure the compresed height in the car before you remove, that way they can work it out purfect for you.
compressing isn't a very good idea, the more you compress them the softer they get
not worth wasting ur money in my opion