Voss et al, JMB 201 :  1988 published shadow cast images of SP-A (which I did a screen print on (right hand box with bar marker of 20nm for all images) and images from my own micrographs of the layered RER granule (intracisternal body) in alveolar type II cells found in some species.  The bar markers are just a little different, which is not at all surprising, but the figures themselves and general size matches are pretty striking. I have compared with structures derived from tangential sections of RER granules (intracisternal bodies) in alveolar type II cells (4 samples on the left).