Ignition coils for an '83 XS400K

[DjSky96]

I'm riding my '83 XS400K maxim as my daily and one of my ignition coils is failing, does anybody know where I could find ignition coils that won't break the bank?

I've tried Mikes XS but they're out of stock and I need to be able to ride the freeway to work, can anybody help?

Also how the hell am I supposed to re-mount the right side ignition coil? Is there some way to open the electrical box under the tank or am I supposed to just suffer trying to stick my huge hand in the bottom?

Thanks