Glenn - mmm looks like ECll*K* are through holes: 688-EC11K1524801

http://uk.mouser.com/Search/ProductDetail.aspx?qs=YMSFtX0bdJBV%2fWLgT6l0hg%3d%3d

Delivery Charge: £12.00 .... ouch.

http://uk.rs-online.com/web/p/optical-encoder-mechanical-encoder/7295668/?searchTerm=EC11K1524801

smile
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LittleBlueThing Running twin 30's