Mini Series Vance Manufacturing Bolt Kit Length Calculator Not sure what length bolt kit you need to mount your Vance Manufacturing Mini Jack Plate? Use the calculator below to save time and money and order the correct Vance Manufacturing bolt kit with your unit today so you can get everything mounted as soon as it arrives. We sell and always recommend stainless steel bolts for Vance Mfg products. **This calculator will only work for the Mini Jack Plates.**