This is from a Matchbox Superfast SF-5 Double Track Race Set. Unfortunately the Yellow plastic track sections did not survive the past 49 years - the sections are very brittle and crack easily when attempting to bend for a loop or curve or connect so I am not selling them.  But I do have the dual starting gate, which clamps to shelf or anything high up to start the race, 2 blue curve pieces to make 180 degrees curves, 4 small blue curve sections (30 degrees?), 2 yellow pieces to make a loop, the finish gate with flags (one missing), one single track clamp, 4 blue track anchors and 8 track connector pieces.  From a smoke-free and pet-free home. Only $9 shipping to anywhere in the continental USA. Extra shipping fees to Alaska, Hawaii, Canada and Puerto Rico.