Is there a difference between front brake pads for W123, are the pads for the models up to 79 thinner?

I have a really hard time to get the pads in, got one in and now the wheel doesn't spin at all. It is almost impossible to get the second one in, the caliper is all the way in.

Wrong pads?

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1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue).