Thanks. My car is #595, so should put me well into the small letter tires. I have had so many 67 mustangs I get confused which had the washer bag or the bottle, and of course have found no pre-restoration shots of my car to show that show which it had. ( the restoration took as very long time, and was completed over ten years ago, and I just can't remember) but I will check the build date now that I have your info.