from a paper by Oskar von Hinüber, probably this is what you were after, and some additonal references (ass simply copy pasted from von Hinüber)

Gérard Fussman: Dans quel type de bâtiment furent trouvés les manuscrits de Gilgit? Journal Asiatique 292. 2004, p. 101-150; Gregory Schopen: On the absence of Urtext and Otiose Ācāryas: Books, Buildings, and Lay Buddhist Ritual at Gilgit, in: Gérard Colas et Gerdi Gerschheimer (Édd.): Écrire et transmettre en Inde classique. (École française d’Extrême-Orient. Études thématiques 23) Paris 2009 [rev.: Jean-Pierre Filliozat, Académie des Inscriptions et Belles-Lettres. Comptes rendus des séances de l’année 2009 [2011], p. 1754-1760; L. Rocher, Journal of the American Oriental Society 131. 2011, p. 133-135; O.v. Hinüber, Zeitschrift der Deutschen Morgenländischen Gesellschaft (in press)], p. 189-219. For more details see also O.v. Hinüber: The Gilgit Manuscripts. An Ancient Buddhist Library in Modern Research: Introduction (in press). — Images from Gandhāra showing the type of a building as reconstructed by G. Fussman can be seen in Isao Kurita: Gandharan Art.Vol. I. Tokyo 22003, p. 260f. and in Giuseppe de Marco: The stūpa as a funerary monument. New iconographic evidence. East and West New Series 37. 1987, p. 191-246, particularly p. 203 fig. 6 with p. 202 note 23: The image reproduced by de Marco was seen in the market at Karachi in 1974. The present whereabouts of the piece seem to be unknown.

jonathan