I bought a pair of  Wilwood mechanical brake calipers a couple of years ago with the intention of using them as a parking brake caliper. The problem was I didn't really care for they're caliper mounting set up.
So I ended up making my own mounting brackets with a sliding pin arrangement.
For sliding pins/sleeves  I used anodized aluminum stock from snowmobile suspension bushings.

E-brake cables are a combination of a Lokar universal parking brake cable set and OEM MGB parking brake cable parts.

It was a bit of a head scratcher to figure out, but overall I'm pretty happy with the results!

A few more pic's

That is awesome, Bill.

Thanks Carl, originally I had a line lock set-up on the rear as a temporary parking brake. It worked OK for awhile, however I feel that this is a more permanent solution. Plus I'm legal in 50 states now;-)

Pretty slick. Easier to deal with than Jag parking brakes too.

Jim