Please help me find a few plomb pebbles!

[DetroitDIESEL444]

I am so close to finishing my deceased great uncle's plomb wrench set. I am in search of the following in decent shape:

3/8 combination (if made in pebble)
1/2 combination

if they made 5/16 and 1/4 in pebbles too I would want them as well.

Thanks!