Just source it yourself:
https://www.motorcycle-superstore.com/2/6/9/1/0/0/DEPARTMENT/Dirt-Bike-Motocross-Pants-Mens-Riding-Gear.aspx#&&Back=0-0-10%2c855-0-373-0-0-24-8-1-1
Just get yourself a "Shop & Ship" account in the USA. You buy, they ship to your "US" address and it then gets forwarded to you in RSA.
I have been using "Aramex" and had zero problems.
There can only be one winner...14 litres of water in the rear and 24 litres of go-go juice in the front. Somebody mentioned batteries, blegh, I pi$$ on them ::)