Number 27a in exploded view Sachs original number 1026010-1000 Ø outside: 19 mm Ø inside: 8,5 mm Length: 19 mm Material: aluminium, grey anodized O-ring material: NBR, petrol resistant Note that there are slightly different widths on some bushings in different Sachs models but as long as it fits, it works.... Most often it is as below but check measurements on your engine so you get the right bushings. 15,2 mm set on 2 gear, both top and block, also on 3 vxl hand gear in the top. 19 mm set on 3 vxl hand gear in block and also in top on 3/4 vxl foot gear. 21 mm set on 3/4 vxl in block