Update Specific Component CAD Dimensions

I have an existing CAD assembly that works well overall, but a handful of components now need their critical dimensions revised. The geometry and intent of the model remain unchanged; only particular lengths, hole centres and clearances must be updated to new values I will supply... (Budget: $10 - $30 AUD, Jobs: 3D CAD, 3D Design, 3D Drafting, 3D Modelling, AutoCAD, CAD/CAM, PCB Layout, Solidworks)