Guys, where can i get adapters for open pod air filter , to be fitted with my original airfilter hose. (mivec engine)

The hose is 4 inches in diameter. Most accessories shop dont have the adapter, they only sell the air filter and then ask us to find the adapter ourself, except for apexi air filter.

I'm planning to buy an airfilter which has 6 inch inlet, and then i need the adapter to convert it from 6 inch become 4 inch

Chop shop have these adapters ar ?

Hope to hear from u guys soon :)