I've changed my alt. position so I don't use the originals any more, but I found one of the old ones. It's 2 9/16" long, the long one. Sorry I can't find the other one. But you should be able to measure it out.
I made my own from stainless steel thin wall pipe, @ 1/2" diameter. Or you can go to Ace Hardware and piece together some Chrome spacers. There is a thick washer under the head of the 3/8" bolt. Watch that you don't bottom the bolt out in the head.
Hope this helps.