Comparison: 1. KA-6971K provides an “adjustable” extension cap for many different depth
2. KA-6971K provides 5 more seal attachment to fit more applications:
48mm: for Audi, VW, Suzuki..etc ; 52mm: Honda, GM, Audi..etc. ; 58mm: Toyota, Honda..etc.
60mm: Toyota, Buick..etc. ; 68 mm: MB, Audi, Nissan, Toyota...etc.