Old Shimano SL-TY18 gear shifters

[PaperKnees]

Hi,

I wonder if anyone has a pair of old MTB style thumb shifter gear levers like these knocking about which they might consider selling please:
http://i.ebayimg.com/00/s/MTIwMFgxNjAw/ ... j4/$_3.jpg

I have an old bike and have some old index type shifters which don't work so well, and would like to get hold of some old fashioned shifters, esp. for the front mech, which are not indexed, as it is loads easier to line things up that way.

Thanks