These small screws are notorious for backing out and becoming lost in the cylinder head!. We offer these BRAND NEW HIGH QUALITY ALLEN HEAD (set of #10) The ALLEN head makes them much easier to get nice and snug than the original Philips design. Second picture shows location of screws on the cylinder head compatible with 1.3L & 1.6L 8 VALVE ENGINE ONLY - Will NOT fit 16 valve engines