Audio Systems: Vehicle Antenna, antenna base, replacement antenna

Question
I recently purchased a replacement antenna rubber mast which came with three sizes of bolts to connect to existing antenna base.  None match.  I need a 15/16 bolt.  The antenna is installed on a motorhome so I do not know the type existing type of antenna.

The question is: do you have a 15/16 bolt.

Thanks in advance,  Jake Terry

Answer
If you are talking about 15/16 diameter in the thread area they are pretty rare; it is not a standard that you will find at Home Depot.  You may need to cut new threads for a 1" or something like that.

If you are talking about 15/16 head on the bolt, they are readily available at hardware stores.

http://www.unified-eng.com/scitech/bolt/headsize.html

Above is table of standard sizes, mostly.

If you give me the make, model number of the antenna I can give you a more intelligent reply.