Usual Suzuki nomenclature for a CDi unit starts with 32900
Alpha-sports and RonAyers suggests yours should be 32900-17E60 but they are US parts based sitesso the spec could be slightly different
Suzuki often uprate parts and change their numbers slightly so it could be something like 32900-17E70 but Robinsons (UK) site doesn't show either of these.
Try giving them a ring on 01227 454366
Just had another look under 32900-17E00 ......
Robinsons says IGNITER ASSY R750W
in stock too.
Mind you, at £578.17 I don't suppose they sell many
It's very rare for CDI units to fail.
Are you trying to fix a problem? If so, what are the symptoms and what have you measured and tested?
http://www.motorcycleproducts.co.uk/catalogue/ignition-coil-12v-cdi-twin-lead-wires-90mm-p-3257.html
I used this coil on my GSXR cheap and works fine
£9995
£4595
£10495