Mick Reeves sells small eyelets that would work for 1/3 and 1/4 scale (and maybe even 1/5 scale). I think at 1/6 scale though it's going to have be more about simulation.

http://www.mickreevesmodels.co.uk/


Here's a source for those "doll" eyelets:

http://www.tinyzippers.com/dollcrafteyelets.html