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Illustrations and extensive description of the items listed below can be seen in Dennis Laney's definitive Leica 1984 Accessory Guide courtesy of Mike Butkus

Leica Code	Description	Production Year	Remarks
ZIOOQ	Extension accessory shoe for Leica If & Leica Ig with flash and finder SBOOI	1954-1960	15546
ZOOAN	Short, chrome focusing mount for Hektor f= 13.5 cm 1:4.5 ; see also ZOOMF	1938-19??	16495
ZOOEP	Short, chrome focusing mount for the Summicron M 2/90 mm to Visoflex II / III		16462
ZOOMF	50 mm extension tube for Hektor f= 13.5 cm 1:4.5 in short mount ZOOAN	1951-19??	-
ZOONT	Special focusing mount for Elmar f= 3.5 cm 1:3.5	1951-19??	-
ZOOSI-HESUM	Complete focusing stage for Summar and Summitar	1951-19??	-
ZOOXY	Focusing mount for Elmar f= 3.5 cm 1:3.5; 1:18-1:2 reduction; "Focomount" NY designation	1951-19??	-
ZPOOK	Table clamp for VALOY II column	1955-19??	17508
ZQGOO	Helical focusing mount with screw adaptor ring no. 3 for 50 mm 1:4,5 FOCOTAR 1:2.5 to infinity	1956-19??	16688
ZSLOO	Collapsible upright with table clamp in 3 parts for traveling; see also YQHOO	1936-19??	-
ZSOOG	Tri-pod extension for short ball and socket to enable wide camera support plates	1938-19??	-
ZTNOO	2 small, chrome cylindrical adaptors for converting tri-pod thread; English & metric	1938-19??	-
ZTOOF	Small, chrome cylindrical adaptor for converting English tri-pod thread to metric	1938-19??	-
ZUPOO	Lighting device for press photographers with 4 chrome reflectors on a vertical stem	1937-19??	-
ZVOOD	Small, chrome cylindrical adaptor for converting metric tri-pod thread to English	1938-19??	-
ZWOOC	Set of extension tubes ZWTOO, BOOXZ, MOOBG, MOODH & MOOGW	1936-19??	-
ZWTEL	Focusing mount for Elmar (II) f= 5 cm 1:3.5 with focus to infinity	1948-19??	NY item
ZWTOO	Focusing mount for Elmar f= 3.5 cm 1:3.5	1936-1950	-
ZWTOO-HESUM	Focusing mount for Summar f= 5 cm 1:2	1936-1940	-