AfrikaKorps heavy Arty

[Steel God]

Rod;

I'm not 100% certain this is what you're looking for, but Gruppe Bottcher, aka 104th Arko, was a concentration of artillery battalions to give weight to the Gruppe Cruwell feint along the coast road at the start of the Gazala battles. It's composition was as follows:

902nd comprised of 12 105L28 leFH18
364th comprised of 12 105L28 leFH18
528th comprised of 12 105L28 leFH18
533rd comprised of 12 105L28 leFH18
408th comprised of 12 150L30 sFH18

I see no indication that the unit had any other caliber guns assigned at that time, but the unit supporting it to the south was an Italian division (the 50th) which had 75 and 100mm Field guns in it's artillery regiment and would been available to lent support.

Additionally, I find no indication that Gruppe Bottcher participated in the final storming of the Tobruk fortress after Gazala, possible it could have been broken down and dispersed, or elsewhere (perhaps along the frontier or near Bardia).

I hope this helps, but I have not been meticulous in my research so don't consider this gospel. Not sure what your intent is with the data, maybe this is "close enough".