Welome. I would say that the importance of the wood grain ash tray really comes down to what you are doing with the car. If you are trying to make a 1000 point correct show car, then it is very important. If not, then not so important. However, IMO a black ash tray looks a little goofy when the rest of the center trim is wood grain.
For the hub caps, are you referring to the P01 wheel covers? My 68 also came with these covers and the emblems are very faded. I've never seen just the emblems available. For restoration, contact Bob Mayle at Stainless Trim Restoration (www.stainlessresto.com
) to see if he can do them. He did an incredible job on my exterior trim. Also keep an eye on e-Bay and Hemmings for a set on NOS covers.
If all else fails, then drop me a line. Quite a while back I picked up a set of NOS P01 wheel covers to use on my restoration. I haven't decided whether or not I am going to use them.