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 Old Skool and SK8-HI Vans – FEEL YOUR SOUL
Vans Popcush Padded Insoles | Snow V3 | Gear West
Vans Ave Pro Blanc De Blanc White Black Blue Skate Shoes Mens US Sz 9 No Insoles | eBay
Insolesgeeks replacement Pop/ultracush insoles a review. : r/Vans