I bought this for my xxl. The fit is VERY tight and its taken a bit of gentle tlc to get it to fit through the holes in the xxl. Also from the holes in the xxl, it looks like the current version will only take one support/tool tray as the arms go through the first and last hole. Its certainly very useful. Shame it is meant to be and has to be removed when the superjaws are folded away.

A nice addition to the SJA300, it gives additional support to longer pieces of stock.
The added tray is useful for holding objects you might need handy

Very handy and very easy to set up, a boon as an extra hand keeps everything in it`s place ,very pleased with purchase.

Using the super Jaws this little tray slips into the frame either side and is big enough to pop tools into thus reduce time bending down to retrieve from the floor! and when adjusted even helps hold wider objects in the jaws so you have an instant table top to work on.

I purchased a super jaws xxl and wanted an extra support. Read reviews and got mixed reports on the compatibility with the xxl. Well I can tell anybody that it does fit the xxl as well as its lighter superjaws cousin. I am very happy with my purchase as well as the superjaws I bought. Both are solid as a rock and very well put together. The support shelf / tray is well worth having. You can trust Triton to do the job required.