I bought a pair of used Raichle 423s and the liners were pretty shot. The material between my feet and plastic base of the boot was pretty thin. I took a few runs and it felt like my feet were broken. My 1st solution was new foot beds! I bought them at Target for under $10. This worked a little. My next step was to see if the thermo liners in my lightly used Lange ski boots would fit. What do ya know, "like a glove" or "boot" Any way the combo of new foot beds and ski boot liners is working great for me. Plus the Lange liner adds a little more support. I'd say see if you can find any liner ski or alpine that fits your good and go buy some foot beds. Just like everything in our sport, its trail and error, and creativity is king.