I have a horn, but need a reed, and bulb. The horn has two tight turns in a race track shape. The flared opening is 6 1/4" OD. I measure the thread as 0.612 OD with 30 TPI. Do I use your type 1 adapter, then the reed, then the bulb? Or do I also need the type 2 adapter to cover the reed? Or do I NOT need the type 2 adapter because the bulb neck will cover the reed? Also, I am thinking the "small" bulb (3 1/4" OD), but what do you suggest with my horn? My horn is 10" high overall by 5" deep. The only marking on it is a capital "P" stamped on the flat surface of the mounting bracket which is 4 1/2" high by 1/2" wide.