Chad at Arcadecup.com has width coils for the WG4900 (id: 009A2838-002)
And I've used G07 width coils on WG4600 chassis' without any problems. You don't get the width range of the original coil but it does work. If you drill out the hole 1-2 millimeters you can get the coil to sit in the original housing which is part of the bottom frame.
Just don't let the coil connectors ground on the monitor frame, you'll blow the power pcb