Well on of the fittings was surely frozen.
1330B6C0-19BA-4285-80C3-2173B02C9E67 by seaswood, on Flickr
That was drilled out.
As you said older style has round holes 84 the replacement has the larger oval holes
1D06ACA1-6864-4BE9-BB29-1EC8E2C04B3A by seaswood, on Flickr
This adds to the list of...