toro520hfan! Welcome to GTTalk! It's good to have you here! I looked through the interchange list and the only lighting accessory that it shows is a sidelight kit. I'm not sure what that would include as I've never seen one. There were a lot of attachments were available for the 500 series tractors such as the rear Tach-a-matic hitch that you would need for the tiller, snow plow, dozer blade, and 2 stage snowblower. There was even a front end loader and rear weight box offered! Here's a link
to the interchange list in our manuals section. It's a very valuable tool for a lot of questions you may have. Always feel free to ask them here too. Thanks for signing up!