Check Steele Rubber for convertible roof rail weatherstrip

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It provides a slight delay in the sound to the rear speaker to give the feeling of a larger space

Another option would be to connect to the GA (Accessory) terminal on the ignition switch with an inline fuse to protect against short circuit.
The backup light would then operate any tine the ignition is turned on.

None of the Patrician carriers will fit the 356 rear axle.

1951-52 are smaller diameter and 1953-55 look like the same diameter but have a different bolt pattern

1953 Packard Cable catalog shows 1U or 1L 30 for the battery to switch cable and 5U or 5L 23 for battery to ground for all 1951-53 Packard cars
The first number 1 indicates an insulated cable while 5 indicates a braided ground strap.
The second number U indicates a leaded brass terminal and L indicates a "leadalloy" terminal
23 and 30 indicates the approximate length in inches

The 1949 and 1950 fuel pumps are the same, AC Type AJ as noted by HH56.
The KEM508AJ number is a rebuilders reference number for the original AC pump which would have had the number 3867 stamped on one side of the mounting flange, abbreviated from 1523867.
A rebuild kit for the 3867 pump should work for the pump with the KEM508AJ number.

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It wouldn't hurt but it also wouldn't help since the pushbuttons only provide a mechanical link to the actual switches that are mounted on a metal bar behind the dash. The electrical contacts are inside the switch.

Here are some photos as requested.
The washers with the large hole go between the shoulder bushing and the contact plate.
The contact plate floats between the horn ring and the rear spring loaded retaining plate due to the extension on the shoulder bushings so that when The horn ring is pushed down it will touch the contact plate to sound the horn.
Apologies for the ugly contact plate but it was the only one that I had loose.

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The transmission fill and drain plugs are both on the right hand side, fill towards the rear of the housing and drain on the lower side at the front.
Overdrive fill plug is on the left hand side of the housing and the drain is at the lower rear of the housing, just in front of the round rear support.

Leaking fuel is a sign that your mechanical pump needs to be rebuilt or replaced