Unfortunately, there are some that were made with rubber domes. The 73G4614 was used with early Aptivas, and 60G0817 was another M2 with rubber domes. Avoid ones with a removable plastic border, as those have rubber domes.
Try and look for a 1395300, which is what was used with the PS/1. 60G3570, 42H0468, and 1395900 I think were also ones with buckling springs, but don't quote me on it.
As far as your issue, I would talk to the seller, since it is most certainly not a mechanical keyboard.