Chrysler P/N for the big upper O-ring which lives just under the hold-down plate in the block bevel is 2095 740, discontinued, and the inner diameter is 1.068". Buna-N or Viton are appropriate materials. Find it around as a "size 121 round O-ring", such as
here (a hundred of them for under ten bucks) or
here (one for 35¢, but shipping will probably make it more worthwhile getting the 100-pack, then when the end of the world comes you'll be prepared).
Chrysler P/N for the small lower O-ring which lives in the groove in the distributor shank is 2095 630, discontinued, and the inner diameter is 0.920". It is a size 021 square O-ring such as findable
here or
here, though it's been long enough since I scrutinized one of these that my recollection of them as square-section could be wrong—they might well start out as round and the outer diameter gets squished flat with pressure, heat, and time. Also possible it's an 020-size ring (outer diameter 1.004") or an 022-size ring (outer diameter 1.129").
These size numbers apply whether you're getting round- or square-section O-rings, so searches are easy. Both O-rings need to be in place and in good condition or yeah, you'll have oil leaks (and increased likelihood of the distributor getting stuck in the block). Make sure there are no chips and chunks of old O-ring stuck in the block recess visible from above after you remove the distributor.
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