Finding specific vector shapes for that purpose will prove difficult Julie.
But are you sure you're loading them correctly? I've loaded several shape libraries into PS7, that were created with/for PS6. All without issue. I don't think they CAN be incompatible. As far as i've noticed, this function in PS didn't change from v6 to v7. (
at least not for Windoze)
May i suggest you try using an image fontset instead?
I have a lot of these, and a specific set that has some of the ones you said you need. I haven't examined them all so other you need may also be within these sets. Let me know if you'd like them and i'll email em to ya. The group of them is too large to upload here.
PS: i create my own custom vShapes by opening image fonts (dingbats/wingdings/glyphs) and choosing the "Convert to Shape" command.