Hi Ted,

On http://www.pinballmedic.net there a explaination about the numbers on coils.
"The majority of Williams and Bally coil part numbers indicate the construction method used to build the coil. The first letter or two indicates the type of sleeve, the position or length of the wire terminal lugs.

An example of a Williams coil part number is AL-23-550. An AL coil has base wire lugs on the left and middle of the coil's base.
In our example - 23=wire gauge; 500=number of turns of wire. "

So the thickness of the wire and the number of turns are the same. Connecting it will be no problem. Use the connections on the outside.