Drivetrain Convertible motor mounts don't fit

I have an '89 hatchback and ordered some convertible style motor mounts from rock auto. Got the old mounts off today fairly easily (jacked the motor up with a block of wood), and got the new ones bolted up to the motor. Problem is, they don't at all look like they fit. The studs line up pretty good with the slots on the K-member, but the flat mating surfaces of the mounts are at a fairly different angle from the flat surface on the K-member to which they're supposed to bolt. I let the motor down slowly, and the studs on the mounts hit the bottom of the slots before the face of the mount is anywhere close to the face of the K-member.

I saw one thread from 2007 where someone had a similar issue, and a bunch of people figured he got shipped the wrong mounts. I took some photos of my situation to see if anyone can tell me if the same thing might've happened to me.

They had part numbers dictating left/right side mounts and I put them in right according to that, but I suppose they could've been labeled wrong. If the studs didn't line up with the slots in the frame I could see that being a potential cause, but as they're both oriented at a shallower angle than the frame I'm pretty sure it would be the same if I swapped sides.