Hi Charlie,
As it happens I just picked up an N.O.S. one of these last Saturday, here some pictures and a sketch with dimensions (they are very odd, neither metric or inch!)
There are at least 2 types of the stand (long and short) and corresponding clip locations, so depending on what contract your bike is, you can figure out what was fitted, better go to the WD Bike website and forum to look for more info;
http://www.wdbsa.nl/
But I'm sure a repro can be gotten in India, have seen them around, sorry mine is not for sale, unless purchased with the whole stand.
Well just found out that the whole thing and more is on the website already!;
http://www.wdbsa.nl/field%20stand.htm
Cheers,
Lex