1974 Spider 2L. Looking to replace the black, small vacuum hoses (5 of them) that are on top of SPICA injection system. Not sure of small size but am looking for source to buy from account this might be the source of my air leak resulting in off throttle back firing. Have checked every other potential source of leaks. Wes keeps telling me "there is an air leak somewhere". Don't see them offered at our usual parts sources. Thanks.