Oxygen & Acetylene setup advice
occasional cutting and bolt loosening
the cylinders had different fittings for the gauges. I was specifically looking at the small portable.
If you don’t need portability, get the largest (within reason) tanks you can afford.
If you want to do cutting or heating, the cylinder's have to be big enough to provide the volume for the your chosen tip.
A rosebud requires a lot of fuel. When I was looking into it, the local ertailer had me call Concoa and talk with a rep.
Here's something else to consider easpecially with older equipment.
See the gage set on the acetylene facing upward.
I don't know the full history, but there was a time when, at least in parts of the country, portable acetylene tanks had collars on them.
The gauge sets were designed to clear the collars. Where I am now, its hard to find those tanks. That becomes an issue because acet is not usually filled at your supplier. They send that to a facility and trade you a full tank IF they have one. Otherwise its a week or two week wait to get yours back.
Third from left and Second from right in this picture off the net
These are sometimes designated POL (Prest O Lite) type of tank. Open the valve with a key.
Some now don't require a key but same situation regarding the gage.

They also dont seem to respect the standard color designations anymore - at least down here. Just a pet peeve.