Well, I see I missed out on a good deal for the RAM I needed. But at least there is another auction for the same RAM here:
http://www.ebay.com/itm/256MB-PC100-CL2-16x8-144-pin-Sodimm-Laptop-Memory-/230621403706#ht_2998wt_840
But will these fit? On one side of the PowerBook G3's CPU card, sure. But the other side of the CPU card requires a low-profile SO-DIMM. These are only "semi" low-profile.