Over a year ago I (based on postings by another recumbent rider either here or on BentRiderOnline) purchased a different item from eBay. Driveline (made in China) sells recumbent-sized (50+ tooth sized) chainring guards. I received a very nice CNC'ed chainring guard complete with mounting spacers and correct length chainring bolts. Being a smooth chainring guard, there aren't any teeth to embed into anything you crash in to or catch your clothing. These are still available on eBay. For example, there is one sized to to guard a 53T, BCD 130mm chainring (a common recumbent chainring size) for $17.99 + $8 shipping from gobike88:
Originally Posted by iconoclast
If you prefer a made-in-the-USA guard of the proper size, they are available (even with custom CNC engraving) for roughly twice that price. For example, I think Purely Custom made them in the size you want (although not presently listed on their web site I'd still contact them), custom engrave if desired, and among their "Bash Guards" model lines offered, one has (although I do not know if it is available in a 53T size):
Soft Touch:The new standard in bashguards is the Soft Touch. This revolutionary product is unlike any other. It's thermoplastic polyurethane outer rim protects not only your bash guard, but the obstacles you come into contact with as well.