Here is a pic of the part...I think they mark it up just a little.
photo 2.jpg
length is 0.837"
small tube OD is 0.336"
small tube ID is 0.249"
large center spacer part that is centered is 0.563" OD and is 0.118 thick
me not a machinist
let me know if you guys want anymore pics. this should be pretty easy to make.