As far as c-clip eliminators are concerned, there are those compaines that make a quality kit and those that do not. Ill tell you this, most of them are in the "not" catagory. For a race car, yeah... maybe, but not a street chassis. The two best kits out there are from Mark Williams and SummersBrothers.
There are a few companies that make weld on housing ends that utilize a press-on type wheel bearing. Mark Williams and Tom's Differential make excellent conversion kits for a press on type axle bearing.
Toms Differential offerings
or
Mark Williams
bolt on bearing adapter or
weld on ends.