I would have told you up front what worked and what didn't... you never asked me. And I went out of my way for you and even lost money trying to help. And I never complained. Yeah you lost money.. but that wasn't my fault at all. And now you are bashing?GC rear collar don't fit at all unless you run crazy soft springs very low; don't waste any time or money on them, because most seller will just sell them to you without telling you that they absolutely do not fit at all even when you told them what were your exact needs and requirements. You can't trust people selling GC slip on for 8th gens, none of them.
Redshift rear sleeves are great and fit well, but ditch the self tappering bolt that is included and use a slightly larger one.
Some older koni insert setup (sold by Redshift back in time) won't fit with GC front collars. Again, don't trust no seller when they tell you that it will fit, because it won't. You'll loose time, money, and have to hear sellers cry about how it is not their fault. Some people really should not be in business without having basic customer-seller dynamic relationship knowledge.
Bottom line forget GC at all (they're great for 2000 and under chassis though), don't gamble on redshift because no one will acknowledge they fit before you spend all your change on them....go for something that works : Koni and coils, or full coilovovers such as KW/ST, Fortune 500 (haven't tried them yet, but will recommend everyone I know to try them without any risk of loosing money on a product that doesn't fit )