I love these things so here is some info:
3 "main" types Universal (most common (MK1 and 2)), T16 (American), Loyd (early war), Windsor(Late war type). I have also seen ones for Canada that had a 2pd gun but were very rare. Many of these were sold to farmers in Canada after the army no longer needed them and now cost about $700 and up depending on condition. However I have found that the T16 seems to be quite rare but it may be because that I live in Canada.
"The ubiquitous Universal, or 'Bren Gun' Carrier, is a well-known hallmark of British and Commonwealth troops in World War 2. Manufactured in Britain, Canada and Australia, the carrier served on every front, in every formation, and in a variety of roles ranging from infantry support to gun tractor to logistics and communications.
Specific roles included Medium Machine Gun (with Vickers mounted on the engine deck), 3" / 4.2" Mortar (the mortars dismounted for firing), and Wasp flame thrower. Models produced include the MkI and variants, the MkII and variants, the U.S. T-16, and the Canadian Windsor carrier.
Ford of Canada produced almost 29,000 universal carriers in WW2, along with 5,000 Windsor carriers. The Universals were powered by an 85hp 221 ci flathead V8, while the Windsors and their American cousins, the T-16s, used the same basic 95hp 239 ci engine as Ford CMP trucks. Weighing in at approximately 5 tons, the top speed on their all-steel 'dead' track was about 30mph.
Armour thickness varied from approximately 3/8" in the front hull, to 1/4" sides. The floor of the carrier was a weak point, having only 1/8" of mild steel, which made the powerplant, gas tanks and crew extremely susceptible to mine damage. Vehicle equipment stowage and crew depended on its allotted role." - Maple Leaf Up