Reported accessories from a well known shop: https://www.weibo.co...ed&loc=nickname
MP44 擎天柱 Masterpiece Convoy (Optimus Prime) Version 3。官方定价50000日元/盒，2盒/箱，内容：主体X1，车厢X1，车厢高射炮X1，小滚珠X1，能量斧X1，光束特效件X2，激光步枪X1，能源宝X1，能量供应管X1，史派克X1，卡莉X1，史派克普拉X1，火箭背包X1，红蜘蛛头X1，红蜘蛛翅膀配件X1，某不知名配件
MP44 Optimus Prime Master Convoy (Optimus Prime) Version 3. Official price 50,000 yen / box, 2 boxes / box, content: main body X1, compartment X1, cabin anti-aircraft gun X1, small ball X1, energy axe X1, beam special effects X2, laser rifle X1, energy treasure X1, energy supply tube X1 , Spike X1, Carly X1, Spike Pula X1, Rocket Backpack X1, Starscream Head X1, Starscream Wings Accessories X1, an unknown accessory
"Small ball" is reportedly Roller. He has Spike, Carly, and Sparkplug plus parts to make him Starscream from "Megatron's Master Plan".
I wanted "Small ball" to be his basketball personally.
But that's Roller's Chinese name.