Wayne, I can't help you with the numbers - but can offer an alternative suggestion.
If it is the trim panel which runs aside the rear window, which forms the extension of the gutter? - between the rear door and window... I was a bit disappointed that the originals were steel into steel panel - and of course.... rust both panel and clip.
I made some out of stainless 1" strap formed over an extension bar to shape and cut to length.
Some bronze brazing rod was then bent to 90 degs and silver-soldered in place.
These formed clips slide into the trim (stainless into stainless).
The brazing rod ends form an insertion post.
I drilled out the (slightly rusted) holes in the rear window/rear door panel and fitted some nylon bushes (from small Ramset wall plugs). The protruding rod then is a tight press fit into those - no more rust..... can be removed as needed by prising out whilst levering slightly upwards over the body gutter (if there's much left of it).....
The above might just be an option for you instead of the HR ones.