Kevin, could you measure both spotlights using these two specific measurements:
Exposed shaft – the amount of tubing visible between the head housing and handle housing when the spotlight is assembled.
Center to center – the distance between where the gears mesh in the handle and where the gears mesh in the head when the spotlight is assembled.
Spotlight shafts cannot be shortened. Doing so would ruin electrical and mechanical function of the spotlight. You would either need to return the light to Larson for a different spotlight with the correct shaft or order a replacement shaft. We will need the two measurements above to identify the shaft lengths of both lights to direct you to the correct parts.