As I worked through annual inspection last month I installed a new Vernier control and the springs were included. No specific part number, but I'm sure McFarlane Aviation will know as they were the supplier. Or a call to Vans with your request.
Two flights with the new throttle and I like it!
Arvada, CO BJC
RV12, #401, Flying 2013, N612PC
RV6, 1996-2010 sold