These need not be expensive or difficult to source. Extend springs: 3/64in. X1in.,1/4in. X7/8in.5/16in.X1-1/8in.,5/16in.X1-1/4in.,11/32in.X1-27/32in.,5/16in.X1-3/4in.,9/32in.X2-13/16in.,5/32in.X3-1/8in.,3/16in.X1-3/4in.,9/32in.X1-1/2in.,11/32in.X1-7/16in.
