I recently have been hunting around for shimless buckets(some places call them solid lifters) for my 5sfe with the small bucket size (~25mm)
What has been claimed to work is the 1.0L 1SZ-FE buckets, these engines were offered in yaris's outside North America.
Also I've found miata's supposedly use the same diameter buckets and they claim that zetec fords has shimless ones they use.
I'm planning to confirm next time I get a chance to go junkyard crawling.
Here's a link to 1sz-fe bucket sizes and associated PN's
http://austarletclub.com/index.php?/topic/8762-solid-lifters-1sz-on-4age-conversion-guide/
