diff --git a/app/controllers/alt_styles_controller.rb b/app/controllers/alt_styles_controller.rb
index 33840614..de7acc4e 100644
--- a/app/controllers/alt_styles_controller.rb
+++ b/app/controllers/alt_styles_controller.rb
@@ -16,10 +16,13 @@ class AltStylesController < ApplicationController
 			format.html { render }
 			format.json {
 				render json: @alt_styles.includes(swf_assets: [:zone]).as_json(
+					only: [:id, :species_id, :color_id, :body_id, :series_name,
+								 :adjective_name, :thumbnail_url],
 					include: {
 						swf_assets: {
+							only: [:id, :body_id],
 							include: [:zone],
-							methods: [:html5_image_url, :html5_svg_url],
+							methods: [:urls],
 						}
 					},
 					methods: [:series_name, :adjective_name, :thumbnail_url],
diff --git a/app/javascript/wardrobe-2020/loaders/alt-styles.js b/app/javascript/wardrobe-2020/loaders/alt-styles.js
index a0f1dc0e..15d4ca27 100644
--- a/app/javascript/wardrobe-2020/loaders/alt-styles.js
+++ b/app/javascript/wardrobe-2020/loaders/alt-styles.js
@@ -72,11 +72,9 @@ function normalizeSwfAssetToLayer(swfAssetData) {
 		bodyId: swfAssetData.body_id,
 		knownGlitches: [], // TODO
 
-		// HACK: We're just simplifying this adapter, but it would be better to
-		// actually check what file formats the manifest says!
-		svgUrl: swfAssetData.html5_svg_url,
-		canvasMovieLibraryUrl: null,
-		imageUrl: swfAssetData.html5_image_url,
-		swfUrl: swfAssetData.url,
+		svgUrl: swfAssetData.urls.svg,
+		canvasMovieLibraryUrl: swfAssetData.urls.canvas_library,
+		imageUrl: swfAssetData.urls.png,
+		swfUrl: swfAssetData.urls.swf,
 	};
 }
diff --git a/app/models/swf_asset.rb b/app/models/swf_asset.rb
index fbd39ea6..64d5f19c 100644
--- a/app/models/swf_asset.rb
+++ b/app/models/swf_asset.rb
@@ -45,6 +45,7 @@ class SwfAsset < ApplicationRecord
       swf: url,
       png: image_url,
       svg: manifest_asset_urls[:svg],
+      canvas_library: manifest_asset_urls[:js],
       manifest: manifest_url,
     }
   end
@@ -147,14 +148,6 @@ class SwfAsset < ApplicationRecord
     ).to_s
   end
 
-  def html5_image_url
-    manifest_asset_urls[:png]
-  end
-
-  def html5_svg_url
-    manifest_asset_urls[:svg]
-  end
-
   def known_glitches
     self[:known_glitches].split(',')
   end