This kit makes the conversion from old SCX10 to SCX10 II axles and CMS/links etc very easy: Pro44 CMS & Titanium Link Set / V2 Conversion for SCX10
Good value also: https://www.rpphobby.com/product_p/ssd00208.htm
Good value also: https://www.rpphobby.com/product_p/ssd00208.htm