In the 6x7 1985 brochure the grip is described (on Page 17), including these words :
"
The grip fixes in place with a screw and attaches to the universal lugs on the left side of the camera body. The strap may be reattached to the right hand lugs for vertical carrying when using the grip"
http://www.lucan.org.uk/pdfs/6x7_broch_85.pdf
The implication is that the grip does not include the lugs, because it recommends using the lugs on the opposite side for a strap. Unfortunately the picture in the brochure has been taken from a direction such that the feature cannot be seen,
An earlier (1970?) brochure does not list the grip among the accessories, so presumably it was introduced later.
http://www.lucan.org.uk/pdfs/6x7_non-MU_broch.pdf
It does look as if the earlier (textured?) grip had the strap attachment lugs, but later grips (smooth?) had the blank covers. I don't know if the studs could be bought separately, but the brochures do not mention it.