Mini Z Racer a sister site to this one. They should have what you need, if not shoot them an email. Look for the dark blue tags for Monster parts.
These are listed for Overlands, but work on the Monster just the same.
Front oil shock
http://mini-zracer.com/shop/product.php?pid=601
Rear oil shock
http://mini-zracer.com/shop/product.php?pid=602
Stock plastic part.
http://mini-zracer.com/shop/product.php?pid=866
Front Alloy (KYOSHO)
http://mini-zracer.com/shop/product.php?pid=1234
Rear Alloy (KYOSHO)
http://mini-zracer.com/shop/product.php?pid=1235
For part requests. There are also GPM shock stays in the Alloy section. Some of those you will need to email on.