most shops will ,elasticate poles for their customers ,which means they take out the old flick tip (usually a carbon solid tip) so usually have one or two too hand.i brought a pack years ago of e-bay mostly glass tips (painted black) and a smattering of smaller carbon tips.
if you struggle too get one ,i have some 1m glass ones with a base diameter of 5.05mm ,with the option of three tip diameters (0.8mm / 1.2mm / 1.65mm ),each one being slightly heavier than the other ( 1oz / 1.5oz / 2oz ) i'm down too my last thirty six or so ,and should be able too spare one .
you'll need too remove the black paint if you want a full white tip .it soon rubs of with fine grade wet&dry .