Just wanted to share this with you guys - bought some FLi FU4 co-axial 4" speakers to replace the tired original ones in the K10. They are a perfect fit, go straight in the same screw holes, real easy job and better sound. Definitely recommend!
Link to the website - http://www.fliaudio.co.uk/fu-coax-speakers/
Link to the website - http://www.fliaudio.co.uk/fu-coax-speakers/