How to determine between 93s and 38s
Finding rails for ZD-7 tables
Take one of the four side rails off and measure the spacing between the two outer bolt holes, center to center.
![](https://cdn.shopify.com/s/files/1/0149/4440/3520/files/Center.jpg?v=1661871895)
If your measurement is 28 3/4", then you have the older-style Valley 93:
![](https://cdn.shopify.com/s/files/1/0149/4440/3520/files/93.jpg?v=1661871895)
If your measurement is 28 7/8", then you have the newer-style Valley/Dynamo 38:
![](https://cdn.shopify.com/s/files/1/0149/4440/3520/files/38.jpg?v=1661871895)