Nitro trailer Wiring Question

[SAL321]

Nitro / Trailstar tandem trailer has 4 wires coming out each side and I damaged the connector and want to go to a 7 blade round. I'm overthinking it I'm sure. Here is what I have and think.

It's just a stand 7 blade Pollack hooikng to the truck. Snipped wires without taking notes and I'm lost trying to match them up to the connector. Are some doubled up ?

2 brown (believe these are side markers)

2 blue w/ brown stripe (undetermined) What would these be used for ?

1 yellow / brown stripe (left turn signal)

1 green / yellow stripe (right turn signal)

2 white w/ brown stripe ( believe these are used in the turn signals / brake )

1 Blue (brake back-up solenoid) '

1 Solid white Ground.

[mikeky]

2 brown (believe these are side markers) and taillights

2 blue w/ brown stripe (undetermined) What would these be used for ? possibly backup lights?

1 yellow / brown stripe (left turn signal) and brake, same circuit

1 green / yellow stripe (right turn signal) and brake, same circuit

2 white w/ brown stripe ( believe these are used in the turn signals / brake ) not brakes or turns, possibly for ground redundancy, maybe to connect ground wire for each light to?

1 Blue (brake back-up solenoid) correct

1 Solid white Ground. correct

[wmitch2]

Was the old plug a flat plug or a round plug, and how many pins ?