Door and window weatherstripping for '62 4 door Lancer Wagon

window channel, front and rear doors
window "cat whiskers" or window sweepers, front and rear doors, inner and outer (set)
front windshield seal with lockstrip

None of these will be difficult. See here.

front vent wing window seal

Not available. If you have a good one, you might send it to Gary Goers for repro.

rear side glass seal with lockstrip

Not available as a one-piece item; Gary Goers has material you can cut and mitre. Lockstrip you can get from Rare Spares in Australia, but you'll have to ask them for extra-long length on it; the linked item is the much shorter length needed for the sedans.

roll-up rear windshield channel/seal

Probably also Goers, match up by profile.