458 Challenge air jack

Hello,

Does anyone know the brand name of the air jacks used on the 458 Challenge? Diameter? I think it's 60mm, but haven't measured yet.

I have a set of Krontec air jack elephant foot which I want to use on my newly acquired 458 Challenge. I found out that the bottom threaded rings on my air jacks are missing which I need to order. But there is no marking of any brand name on the air jacks.

TIA,

 

i believe they are Sobek, from Germany, but may be dependent on which team ran your car and what they preferred.

 

I measured the air jacks. The OD is very close to 62mm which doesn't appear to be a standard size. So I am having the threaded sleeves made by my machine shop so that I can use the elephant foot stands.