ok so I am adding new vehicles but one is now a ghost vehicle as it will drive through units with no damage to them and ordence does not damage and passes through it. how do I fix this?

Sounds like you didn't set up collision properties for it. For example, from the stock all_hover_combatspeeder.odf:

will the name ie p_sphere1 be different for all vehicles?

Could be. Open up the msh file and find out.

Are these vehicles you created in and are just trying to put in game?
If they are you will need to add collision primitives to your model prior to export.

If these are previously made models then you will have to as suggested to do a search of the
msh file for anything that should have p_ somewhere in the name.

they are the swamp speeder from the convo pack and the stock republic fightertank