Martin
The early canvas tool pouches were later made with the ripstop nylon. You will want the early canvas one. Here is a link to NOS ones on ebay for a very reasonable price:
http://www.ebay.com/itm/WWII-US-ARMY...fLlUhrrKnlv9Qg
There are plenty of the 5 pound Ansul extinguishers on ebay as well, but the blue colour ones are special to DND. The red ones will be identical other than the colour.
I can't say I have ever seen those straps in Cdn service. The manual does show some straps pn A379303, but does not give much detail.
The shovel bracket is the same as the M38 Jeep. PN is 7375162 and are fairly common on the repro market:
http://midwestjeepwillys.com/7375162.html