Finally we have the perfect complement to our valves. The valve spring Retainer made of tool steel replace 100% of the Type 4 Original (021 109 641 B) and are still a good 5g lighter per piece. Furthermore, you do not build up so far upwards and can be combined with an inner spring. Thus, the use of double springs with a type 4 spring is possible. The sale is of course per set (8 pieces).