[Brian]

Zigg, It'll only be the rear main you need to change. The rear main bearing you require will be #81A- 6331, followed by a letter, which designates the undersize. You'll need to measure your main journal with a micrometer to ascertain what size it's been ground to, and find the appropriate bearing. If you post the measured size, I, or several others on here, can give you the exact part number you'll require.
You'll not need a complete set, so forget about paying $600.00 odd, you'll only need the rear main, and any number of suppliers can provide that.