They are somewhat popular with the 4X4 crowd, and can be had to fit the back of a number of different transfercases.

What do you want one to fit?

Many AD Chevy big trucks came standard with driveline parking brakes. perhaps you want a 4 speed with one already on it?

For my project I needed to make my own, here's what I came up with.
http://rides.webshots.com/photo/2121884060080251109yYWDmB
Even used the original parking brake lever.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-