I have a new set of Whiteline Rear Sub-Frame Lock Bolts for sale. Not in packet but never used. (Sold)
$20 + shipping, I think they go for $30 from the shops + shipping.
Shipping should be $4 and I eat the paypal fees.
"The KSB750 Subframe Lock kit is designed to lock the rear subframe on the Impreza, WRX and certain Legacy models. It allows for more precise alignment of the rear wheels and limits the amount of rear subframe movement under cornering loads, which can result in poor dynamic alignment settings. Simply insert and tighten, for race days to lock the rear Subframe in place for increased performance."