Those are what I have, it was easily worth the money. I understand what Trev is saying, but if your springs are all used up then no amount of oil changing is going to make a difference. My old one's were horrible, before I switched my front and rear springs my cx was like a pogo horse, it wallowed around corners and was just plain scary at times. I don't know how much the RaceTec springs are compared with the Progressives, but I'd definitely call instead of taking chances on ordering. Mine have a 1 inch preload spacer right now with 20 wt oil, it's comfortable and works really well for me (190 lbs).