1. There are only so many different bow rollers available. You can check them out at West Marine online or in their catalog. Garhauer I also think make rollers.
2. Check the Rocna website. They have many pictures of their anchors on different boats, mine included. Since the shapes are very similar, you can browse their picture file.
3. We kept our old OEM "toy" bow roller for our Rocna 10 (22#), and so did a friend with a heavier Rocna. See this with pictures:
http://c34.org/bbs/index.php/topic,5336.0.html
4. Don't know what your physical conditions are, but many have hauled 35# anchors without windlasses for years. Maybe that's why their back go out!!! But someone posted, perhaps on that thread, that if you do it right, the only things you're pulling up are the weight of the chain and the anchor, since you should be directly above it when you weigh anchor. I deliberately stay with a 22# anchor 'cuz I sized my system for where I sail. See:
http://c34.org/bbs/index.php/topic,4457.0.html, which also has some pictures.
5. You may also be interested in this anchor system sizing topic:
http://c34.org/bbs/index.php/topic,4990.0.html