They have a Longer drop I took rough measurements and compared then to yours and it would appear that the u shape metal is 4" with the bush on top it's closer to 5" makes sense if the stock suspension sits higher, than impreza. the rest looks almost the same given I've had a proper poke around, think cos yours are black it threw me a little.
If I could use the impreza mounts I think it would have less chance of twisting being shorter, but I think it will mess up the ride.
I've ordered the whitline mounting kit but it won't be here till end of march
[emoji25]