Dale, In my opinion the 6305 bearing is NOT the right bearing for your steering spider. All the spiders I have pulled apart have either had a solid steel self aligning plain bearing or a self aligning ball bearing. The point of using a self aligning bearing instead of an ordinary ball bearing like 6305 is that a self aligning bearing will allow a certain level of misalignment between the steering box output shaft and the bottom bearing retainer, where an ordinary bearing will allow little to no misalignment. In a lot of cases the fittings welded in each end of the steering column tubing are not welded perfectly straight anyway so the self aligning bearings allow the steering shafts to turn smoothly in the bottom bearing retainer and will eliminate possible tight spots while turning.
The self aligning bearings that I have pulled out, all have the same details as follows below. A quick check of Google shows that there are modern equivalent for this bearing.
New Departure 2605 Made In USA
Regards, Nathan