All 1400s came with that "starter card"...a little known fact with the 1400 is that it actually has two RAM slots on the board - there's the "consumer" RAM slot where the stackable RAM modules were installed, and the "Apple" RAM slot, where a 4MB or 8MB card was installed to bring the machine up to 12 or 16MB, in conjunction with the 8MB soldered onto the mobo. As far as I'm aware, nobody apart from Apple themselves ever made anything for the "Apple" slot.
For what its worth, the easiest way to get to 64MB is to have the 8MB Apple card already installed, and then install two stackable 24MB modules.