Originally posted by clmbia45
My old Vetec spring looks the same as the kit one. The Mugen mtx3 spring is also 1.8 mm diameter, and the same width but is 10 mm long instead of 9 mm.
I use the Mugen hard silver spring on my 705 Centax II clutch. Although like you say their springs are like 10 mm long, it'll fit fine in the Serpent Centax clutch.