Found a site that sold Vans Ultracush insoles and put them in my Sk8 Hi's. Such a good decision. The difference in thickness is striking. Link in the comments for the website
Vans Pop Cush, Ultracush Pro & Comfycush Insoles Replacement - IGS
Vans Insoles Overview - YouTube
Various Branded Insoles Footbed Ortholite Inserts Vans Born from Genuine Shoes