+1 to Delta-compatible. Those look similar to the PP 286 model. Yes, they are technically ARC, but they take either the Delta or Arc cleat. The ARC cleat is basically the same shape as Delta, but allows for some extra float. See page 3 of the 1993 and page 3 of the 1995 catalog linked below.
https://pyfrides.files.wordpress.com...7/cat-1993.pdf
https://pyfrides.files.wordpress.com...-equipment.pdf