hi Graham thanks for the info ive looked at both the 199b and the 198b today they both look the same. i think the amal carb on the 198b is abit bigger than the bing on the 199b so the rubber boot has to be streched on the filter. as for the spacers i havant looked yet. the box as been repaird but i noticed a split in the top probely could be fixed but ive got a new airbox to go on, sopose i could plastic weld it but i looked at the price off the plastic welders cheaper to buy a new one, unless i look for a place that dose platic weldind, cheers bondy.