Dimentions

The dimensions of the vehicle are illustrated in the following image

Details from the Instruction Manual:

in mm	Lenght	Width	Height		Ground clearance	Overhang		Wheel base	Track		Turning circle in m
			with cover	without cover		front	rear		front	rear
Van	4570	1845	1965	-	190	1160	950	2460	1583	1570	10.7
High Roofed Van	4570	1845	2365	-	190	1160	950	2460	1583	1570	10.7
Combi	4570	1845	1960	-	190	1160	950	2460	1583	1570	10.7
High Roofed Combi	4570	1845	2360	-	190	1160	950	2460	1583	1570	10.7
Caravelle CL, Combi L, Caravelle GL	4600	1845	1950	-	190	1175	965	2460	1583	1570	10.7
"Joker" with pop-up roof	4570	1845	2050	-	190	1160	950	2460	1583	1570	10.7
"Joker" with high roof	4570	1845	2520	-	190	1160	950	2460	1583	1570	10.7
Ambulance	4570	1845	2215	-	190	1160	950	2460	1583	1570	10.7
Pick-Up	4570	1870	1930	2235	190	1160	950	2460	1583	1570	10.7
Pick-up with large platform	4570	2000	1930	2235	190	1160	950	2460	1583	1570	10.7
Double Cab	4570	1870	1925	2230	190	1160	950	2460	1583	1570	10.7

Wheels

Specifications of the factory wheels for VW Transporter T3 :


Steel wheels - 5.5x14 5x112 ET39

Wheel height	: 14 in.
Wheel width	: 5.5 in.
ET (offset)	: 39
Number of bolts	: 5
PCD	: 112mm
Center bore	: 66mm
Bolts thread	: M14 x 1.5
Tyres	: 185 R 14 C 6 PR

Alloy wheels - 6x14 5x112 ET 30

Wheel height	: 14 in.
Wheel width	: 6 in.
ET (offset)	: 30
Number of bolts	: 5
PCD	: 112mm
Center bore	: 66mm
Bolts thread	: M14 x 1.5
Tyres	: 205/70 R 14

Great resource of information for Mercedes wheels is the following:
http://www.alloywheelsdirect.net/mercedes_alloy_wheels/


Information from official manual and here