By way of a "bump", this thread has a few pictures that might be useful for a quick visual comparison;
WM18 Power Feed
..or perhaps some "leads" for correspondence..
If it's any further help, I see the Warco unit suits a number of different models which are all listed under the same part number, so I'm guessing that there's some rationalisation of feedscrew sizes etc. across the range – are the handle (shaft) ends on your '30 17mm? – certainly the Warco Major's (listed as a suitable recipient for the kit) are.
If one can establish that the wormwheel will fit the shaft, that would be one of the more potentially-troublesome variables out of the way..
The feedscrew brackets/bearing housings look rather more variable – Whether fitting for all models is a simple like-for-like replacement of parts seems to be a moot point perhaps..?