AL --> Amplatz Left

see this:

https://radiologykey.com/guide-catheter-selection-manipulati...
In the presence of a large aorta, it is preferable to upsize to an EBU 4.5 or JL 5 or to an Amplatz left (AL) 2–3 if a better support is needed. The AL guiding catheter is also valuable for the posterior and anterior left main takeoff and for interventions on a circumflex artery with a sharp angulation or abrupt downward origin from the left main. Thus, this catheter customarily provides less passive support for right coronary interventions. When a stronger passive support is required, the AL 0.75 or 1 is a good alternative.