I discovered the uniqueness that is the VF1000 main fuse today, a Sunday afternoon.
Needless to say I could not get another, so I discovered that by careful removal of the plastic coating, a 30amp blade fuse can be made to fit.
By carefully twisting the two sides I can use the two pole connectors to clamp either end. I’ve now ordered the aftermarket solenoid with the built in blade fuse holder from David Silvers.