Greg Bender
http://www.thisoldtractor.com/gtbender
The original studs are 8 mm x 1.25 mm x 42 mm. I purchased some replacement 40 mm long 18-8 stainless steel studs from McMaster-Carr (item number 93805A359). They work great although next time I would purchase 50 mm studs and remove the excess as the 40 mm are just a bit short.