Installation Aid – MAX-FIX II £15.00 Add to basket Out of stock Installation aid improves the fit of the child car seat in the car. The installation aid should only be used when there is a gap between the car seat back and the rebound bar. JUMP TO ... Installation Aid – MAX-FIX II Questions & Answers Accessories Installation Aid – MAX-FIX II Out of stock £15.00 Add to basket Questions & Answers Accessories