I did look on-line when I saw your original post and couldn't find any attachments to fit it. I'd find links that touted attachments, but I could not find any like you are looking for.
If finding something to make rows is a priority, I'm pretty sure you could possibly weld something onto the framework of the tiller to put another brands attachment on it. Where there's a will, there's a way.
I have an older front tine tiller by Sears and have to pull my rows with a hoe and shovel. I sure miss my TroyBilt Horse 8hp tiller and attachments.