I've purchased the Webra throttle arms before. There are two different lengths offered, or have been, just so your aware.

The thread size for it is an M2.5 and threaded rod for it is at [link=http://www.smallparts.com/s?ie=UTF8&refinementHistory=subjectbin%2Cmaterial_ browse%2Csize_name%2Cmeasurement_system%2Cthread_s tyle%2Cbrandtextbin%2Cenc-merchantbin%2Cavailability_class%2Citem_length_str ing%2Cavailability%2Creview-rating%2Cdate%2Cis_prime&pf_rd_r=06365SNDY05MV77K2 GYN&pf_rd_p=417978501&searchNodeID=16410711&pf_rd_ i=16410711&searchRank=salesrank&field_size_name=M2 .5&pf_rd_s=center-2&searchSize=25&pf_rd_m=AIUBT5HP6PMAF&pf_rd_t=101& searchBinNameList=subjectbin%2Cmaterial_browse%2Cs ize_name%2Cmeasurement_system%2Cthread_style%2Cbra ndtextbin%2Cenc-merchantbin%2Cavailability_class%2Citem_length_str ing%2Cavailability%2Creview-rating%2Cdate%2Cis_prime]SmallParts.com[/link] and can also be used for replacing the throttle plate adjustment.