Had to do the timing belt on the Astra and came across these at Supercheap Auto, at $19.99 can't really go past it.
$19.99 Save $40
3000kg maximum capacity.
Pin type adjuster.
Height range 318mm to 476mm.
Price is great in my opinion saved me a minimum of $30 and seems to be an abundance of Supercheap Auto Stores.
Postage is available but pickup is the way to go, to me shipping is $18.39 TNT regional NSW, can also order online and pickup instore.
Used them today and I have no complaints :)