Cat emergency, some advice?

I have two cats which I cannot keep; don’t really have the space (too many other cars already) or the time to devote to them. Was from a mamma cat that was abandoned. Took care of them all until they were off the teat then found homes for 2 of them. The two that were left I tried everything to find homes, and yes, I did try Craigslist, nothing has worked. They have 26 hours as of 4:15 PST to find a home or I guess it won’t look good for them at all. Anyone know of any group, etc. in the Concord, Ca, area that will come rescue these cats or is the pound their last stop? Any creative ideals that will make someone want to give them a home because I don’t care if they don’t go home they just can’t stay here?