The housing length really doesn't have anything to do with how the rear bar will fit unless its narrowed down to look like it has a pair of pavement rollers under it. As stated by 72bluNblue, look to Hotchkis, Hellwig and Firm Feel for bars, down load their directions to see how they install and it will become clearer. Of the 3 the Firm Feel bar installs like the stock rear vars did on later cars. I have Addco bars front and rear, bought them long before there were any other options. The bars are good but the install hardware sucks, I've replaced a lot of it but look at their directions from 1982 and you'll get the idea.