m_hatcher, I think v7guy's DP has some bronze bearings in it, whereas yours is using all ball bearings. In that sense, the two of you have dissimilar bearing replacements going on.
v7guy, I'd be willing to bet that someone over at owwm.com has machined new bronze bearings for one of these DPs and can guide you in the process and specs.
m_hatcher, here's a photo of the feed stop gasket you are referring to. Measurements are:
OD 2.062"
ID 1.625"
Thickness .122"
You can cut it from some flat rubber and trim it to fit in like this one:
As to the washers between the top of the quill and the quill stop....your photo shows the Spindle Collar, but you are missing the Washer and the Rubber Washer (parts 18422 and 18429 on the parts diagram for this DP). This is what those parts look like installed:
And opened up:
The size of these two washers isn't something that has to be super-precision; if you can get close to these measurements, you should be good to go. The rubber washer could be easily made, and the metal washer can be easily modified out of another washer.
Here's the measurements of the metal washer:
OD 1.06"
ID .631"
Thickness .054"
Here's the measurements of the rubber washer:
OD 1.06"
ID .631"
Thickness .185"
Lastly, I wouldn't worry too much about the bearing fit as you have described it. The test will be whether or not you have spindle play after reassembly.