Install door lock question 90 Accord

I am preparing to install door locks on our 1990 4dr Honda accord DX, in preparation for an alarm/keyless install. Since there are no lock motors or electric windows, the manufacturer never installed a wire harness gasket between the b pillar and rear doors. There is a rubber plug at the pillar and another in the door. Is this gasket an item available aftermarket, or must I order it from Honda?

Thanks.

Steve

Jeff, thanks for the suggestion, but some bad news from the dealer. Turns out that part is molded onto the wiring harness - and is only available from the dealer that way. I imagine I won't be able to remove it from the harness at the junkyard, either.

I'm planning to fabricate something, using the existing hole plugs at the ends. I was going to use heat-shrink, but that ended up way too stiff. I may next try rubberizing some soft nylon sheathing - I'll post the results, or whatever I come up with. worst case, I could probably just tape-wrap the wires, pass them through holes poked in the plugs, then still seal with liquid rubber.

Steve