Many Different Versions Here - 203-110 is the Earliest Case Style, 203-109 is the Later Case Style, and 203-109A Which is the Same Later Style Case - But Different Internal Parts. This Unit is 45-55A, With the Adjusting Ear Directly Opposite the Mounting Ears. There is Another Unit, OEM No. A5T15471 - We Call This the 14646, Which Looks Just Like the 203-109, Except the Top Adjusting Ear is Slightly Offset. The 14267 and 14646 Will Interchange in Most Cases, if Desired. The Larger 65A Version of the 14267 is the 14698.