Lower Radiator Hose Spring

I've seen 'em for sale occassionally but yes its true they are generally no longer used.
Carroll Smith mentioned this is one of his books about race car prep. Seems the hose materials and construction improved greatly from the 1960s and 70s. His books are from the 1980s if I recall correctly, so it been a while since the manufacturers have felt confident the return hose won't collapse.