It’s funny how these things work! Another thread popped up around the same time as yours Werner:
In that thread this other thread was brought up: Building a 2x-AA P60 for a friend... - if you look in the OP he links to a product at KD (either HY-501DC or KIN-501C) which is apparently an extended Ultrafire 501C which is meant for 3*CR123A… (eg should fit 2*AA)
EDIT: There I go again, linking to the same thing twice. I fixed it.