Good Morning Greg.
I have just purchased one along the PK11A which is needed when using the D2H. 2xPB6-Ds spacers for lifting the body over the bellows, a BR-2A reversing ring for lenses with a 52mm thread, a MC30 and a 24mm Nikon lens.
I will begin using this combination later this year for large magnification work involving set butterflies. I may also try it in the field but it would need very very still conditions which, as I live on the coast, I do not get very often.