What do you see at the bottom of a lock-up converter? 1984

[Aracer]

Any idea's out there as to where to get the M.P flex plates and how to identify a lock-up converter or charts to identify the part # ?

I have a new old stock  11" 727 torque converter, 9785 stamped and on a sticker, and ink code 102215. Factory box "1985". It has the splines inside on top edge of internals, so that's high stall along with hand punched, 2788. It appears to have nothing extra in the bottom of the opening. The only thing that is different are the wider (5/16") pads that are symmetrically spaced, all 7 1/16" apart.

 I found two Mopar Performance, Flexplate's part #'s for symmetrical vert. to 6 bolt offset crank pattern, but they can't be found.

 # P5155427 Flex Plate, RWD, Butterfly, 727/904 Transmissions, No Ring
Gear, Requires Converters with Integral Ring Gears, Drilled
for Both Patterns Even, and Offset, 5.7/ 6.1/ 392 Hemi, 5/16"

And,,,,,,, P4876706 Flex Plate, RWD, 1996-2003 5.9L Dodge Truck
Magnum/Jeep Engines, Can be used with SEFI symmetrical
bolt pat.

I researched converter# chart's and can't find any, here's what's on the box 512119785 and 9785 on a ups sticker on the conv. also A654  someplace.