out here in Cali, they have made the laws so strict that I once failed a smog test because I used a piece of heater hose, instead of a moulded smog hose from the air cleaner to the AIR pump.They have marked hoses now for calif emissions.
What that did was force reputable auto parts stores to carry more emission parts for older vehicles. I got mine from Napa but it took a few days to get it to this store