What air over hydraulic piston for my engiine hoist?

I have a bunch of stuff to do with my engine hoist. The piston STB since the last time I used it, cannot get a small-ish engine onto a stand right now.

Figured I'd pay a bit more for an air one rather that pumping forever.

The Hive says what?

I put one of these on my HF hoist. Its pretty great. 
https://www.harborfreight.com/8-ton-long-ram-airhydraulic-jack-58816.html?utm_source=go&utm_medium=social&utm_campaign=shortener

In reply to TJL (Forum Supporter) :

Thanks, no clue why I could not find that earlier. Found some on Amazon but will probably get the hammer store one.

Hmmm, just checked, mine is square bottom. may not matter though.

Heres mine. 

I guess I can fab that. Mine bolts to a square plate that has the swivel.  Or maybe it will work.

You might be able to just ditch that pivoting plate and bolt it up to the existing mount.  But yeah, worst case some minor fab will get it to fit. 

I replaced mine with this one - came with a flat base and a pivot plate adapter.  No complaints in the 3 years I've had it.

https://www.amazon.com/gp/product/B00CPTBEZO

I ordered the HF one just now. I grew up in Pittsburgh...