1. IF YOU HAVE YOUR OLD MAT AND IT IS NOT SEVERLY RIPPED- MEASURE ITS LENGTH & WIDTH.  (NOTE THE EXACT INCHES) DO NOT MEASURE THE TRIANGLES BUT MEASURE TO THE EDGE OF THE HEM.  MEASURE ALONG THE EDGE OF THE MAT. (ALSO, IF IT IS NOT RIPPED, MEASURE IN THE MIDDLE OF THE LONG SIDE AND IN THE MIDDLE OF THE SHORT SIDE. NOTE THE EXACT INCHES.)

2. COUNT HOW MANY RINGS/GROMMETS DOWN THE LONG SIDE & SHORT SIDE OF THE MAT. (NOTE HOW THE SPRINGS HOOK INTO THE MAT.)

IF YOU DON'T HAVE YOUR OLD MAT:
Observe how the spring actually "hooks" into or attaches to the frame. There are many different methods.
1. WHERE THE SPRING HOOKS/ATTACHES TO THE FRAME, MEASURE STRAIGHT ACROSS TO THE OPPOSITE SIDE, WHERE THE SPRING ATTACHES TO THE FRAME. (NOTE THE EXACT INCHES)

2. COUNT HOW MANY SPRINGS ARE NEEDED ON THE LONG SIDE & NEEDED ON THE  SHORT SIDE.

3. MEASURE THE TOTAL LENGTH OF ONE SPRING OFF OF THE TRAMPOLINE INCLUDING HOOK TO HOOK. (A GOOD SPRING RECOILS TIGHTLY, WITH NO GAPS BETWEEN COILS.)

4. NOTE HOW THE SPRING HOOKS INTO THE MAT.