Help with Blueprints needed

Please see attached screengrab - My stand is called SM_Platforms_ShoeStand_C3, it is an instance of Static Mesh called SM_Platforms_ShoeStandB. My shoes are a BP called BP_Air_Jordan, this BP parent is SM_Platforms_ShoeStand_C3.
I need to create a variable in my BP_Air_Jordan, so I create one, but I dont know what variable type it is. Please also see beloew BP_Air_Jordan, I chose Static mesh variable type and referenced the SM_Platforms_ShoeStandB but I cannot attached Stand variable to the Attach Actor To Actor