In the instance when purchasing a new ashtray for your classic is just not feasible (not available, price too high, etc.), why not restore your current one? Sure, it may look really ugly, but that can be fixed pretty easily.
Let’s face it, filthy ashtrays not only look bad, they smell bad too. First, clean them thoroughly with soap and water. A toothbrush or small wire brush may be needed to get rid of encrusted buildup. After the parts are completely dry (use a hairdryer if necessary to get into the tighter cavities), it’s time for paint. Spray metal ashtrays with silver (or metal colored) paint to make them look new (Krylon Stainless Steel works great). Spray plastic ashtrays with crystal clear lacquer to make them look unused.