1970s 50cc Gilera Airbox silencer

This is an airbox silencer for 1970s 50cc Gilera Motor bike. I created this as I replaced the standard air filter with a K&N E-4513 air filter that is larger. The original silencer will still fit, but I created thsi one, it raises 20mm above the air box (allowing more room inside for the filter) and has larger intake holes and one extra one to allow easier air flow.

Need M5 x 30mm screws to hold in place