I just replaced these with new ones on my 84 300TD, but the old ones are still in reasonable shape and hate to throw them away. The clear plastic is fogged and there are surface cracks in the plastic, but they aren't broken anywhere. From a 1-10, I'd rate them a 5 or 6.
Here's what they look like (not the actual photo):
http://www.***************/secure/PartImages/1305542902.jpg
Figure these would be a good alternative for somebody with cracked ones that are looking for some solid replacements for a good price. $25 for both, includes shipping.