Here is an overall list of the specific dimensions of the "M" Track Stubby Tracks:
5101 Standard Radius Curve (half full curve)
5102 Standard Radius Curve (quarter full curve)
5107 Straight 3.54” (90mm long) (half full straight)
5108 Straight 1.77" (45mm long) (quarter full straight)
5109 Straight 1.32” (33.5mm long)
5110 Straight 0.88” (22.5mm long) (eighth full straight)
5129 Straight 2.76" (70mm long) (special straight)
5201 Big Radius Curve (half big curve)
5205 Big Radius Curve (~1/6 big curve)
5206 Big Radius Curve (~5/6 big curve)
5208 Straight 5/16” (8mm long)
5210 Straight 5/8” (16mm long)