Yes they just snap into any empty slots doesnt matter which numbers you use really just put them all next to each other, when all three are in push the purple tab in flush and that will double lock the crimps into place
It looks like you have bought a totally empty fusebox and not the 'add a fusebox' part that you would need for a towbar, the unit you normally get hasd a power rail on one side of the fuses and a power lead/fuse to run back to the main battery ??
It looks like you have bought a totally empty fusebox and not the 'add a fusebox' part that you would need for a towbar, the unit you normally get hasd a power rail on one side of the fuses and a power lead/fuse to run back to the main battery ??