Very hard to find pair of rear seat ashtrays + donor ashtray for a 1951 Mercury convertibles. These are a little crusty, but definitely usable. The 1951 only knobs are in very nice shape. The bottoms of ash receptacles have some typical rust-through. You will need to do a transplant on the knob from the rusty lid onto the donor ashtray with the chrome lid. $75 shipped CONUS PayPal friends and family. Buy with confidence. I've done many good deals here with HAMBers over the last few years. I have 1000+ 100% positive feedbacks since 1999 on Ebay under username rw4951.