Here's the finished bearing end cap. I used a piece of 3" hose, a couple of clamps and I hacked and welded on the outer dust cover off a Peterbilt rear shock absorber. I drilled and tapped it for a plug that will set the oil level in the cap and it can be rotated to adjust the final oil level once installed in the car. I filled it with a couple ounces of 15W40 diesel engine oil. After a few hours nothing leaked out.
My buddy Matt (the machinist) advised me to go with oil instead of grease to lube the end bearing because of the high speeds it will be spinning. Grease would probably just fling out, causing a dry bearing situation. Dry is bad.