According to Doug Sweetland's book, here is the LW roster for 1953:
2 D82R
5 D82aR
5 D82bR
5 D82cR
1 D85R
6 D85aR
18 D85cR
16 D85dR
4 D85edR - coffee shop car, so probably NY commuter
2 D85ad - used for Senators
2 DL85d - used for Congressionals
A total of 66 cars. Probably only 58 for the Pennsylvania Limited service. D85cR/dR are 59% of the roster at the time, so I would probably go with one of those two. All the D82 series is only 29% of the roster.