Linkage kit T25,Bay,Type 4These 2 twist linkages are made from high quality material and they are equipped to guarantee a perfect tuning. Type 1 means Type 1 engines with twin carburettors (IDF DRLA KADRON ICT). These are not appropriate for engines with Porsche style cooling. Type 4 means Type 4 engines with twin carburettors (IDF DRLA KADRON ICT). These commands are also used on every Type 1 or Type 4 engine with Porsche cooling. Sold each. NON STOCK ITEM CONTACT US FOR