I built an extended seat post for a Vilano Urbana

Vilano Urbana Single Speed Folding Bike

Check out the #14 post on it (don't have the skill to have you link straight to it)

Note:
Common seat post sizes
27.2 mm = 1.07inch = 1 1/16
28.6 mm = 1.125984 = 1 1/8
30.4 mm = 1.19685 = 1 13/64
31.8 mm = 1.252 = 1 1/4
33.9 mm = 1.335inch = 1 21/64 (close to 1 5/16)Common shim sizes

Shim sizes
33.9 - 27.2
33.9 - 31.8


Miscellaneous lengths

600mm = 24"
640mm = 25 " ThorUSA LOOONG standard $38