1. Double Pin Lock L/30 (pair) Part No. 14900-8022 

2. Double Pin Lock S/28 (pair) Part No. 14220-8022

3. Double Pin Lock Oval L 28/31.5 Part No. 14900-8019

4. Double Pin Lock Oval S 26/29.5 Part No. 14900-8019 

Duotone could give us a nice little chart to let you know which adjuster fits which boom, but they don’t, so “nil pointe”. Fortunately you Windsurfers are a clever lot so it isn’t too complicated. It’s the Silver booms need the oval and Black booms need the standard.