Kevin,
One thing I have found on the Manley locks and retainers, they measure different when used with another manufacturers parts. For instance if you take a Comp retainer and measure the installed hgt with a Comp lock, and then try it again with a Manley lock, it will measure different. I found this out a long time ago. I pretty much stick with one manufacturers parts. If I am using Comp retainers, I use their locks. Comp seems to be the most consistent over time. I have some single Comp retainers I bought 15 years ago for checking stuff and they still are identical to what you buy today. I would bet Crane is the same way. Cant say that for most other brands.
Some of the less expensive house brand stuff is the worse, it will vary from part to part in the same package
