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
FOOTSOULS for Authentic, Era, and Slip On Vans – FEEL YOUR SOUL
Replacement Vans PRO Ultracush Insoles GK-1801
Vans Ultracush Insoles Arch Support Inserts Pro 114 Height Increased US MS 11-13 | eBay