0-0-0 Posted October 27, 2023 Posted October 27, 2023 Hi. Just posting here, to document some data. Hope it gets onto the search engine listings. With helpful advice for anyone replacing these parts For rear upper control arm (driver POV/looking at the back of the car) LEFT SIDE 48790-59045 RIGHT SIDE 48770-59065 Balljoint Balljoint bolt size: M12 Pitch: 1.25 Nut size: 19MM Front side bolt 90105-12327 Rear side bolt 90105-12326 Bolt Bolt size: M12 Bolt pitch: 1.25 Bolt strength grade: 11 Bolt length is measured WITHOUT HEAD, WITH FLANGE. Front side: 85mm Rear side: 75mm Bolt must be partially threaded. Bolt thread length: 25mm (more is OK). Nut size: 17mm REPLACEMENT SHOPPING LIST: 1* M12 1.25 Pitch grade 10.9 bolt size 80mm 1* M12 1.25 Pitch grade 10.9 bolt size 90mm 3* M12 1.25 Pitch nut 5* M12 washer Optional: Copper grease Threadlocker Suggested replacement advice: Balljoint bolt is notorious for being damaged/difficult to tighten. Do not attempt to use a die as the balljoin will spin loose. Get a bolt file with a 1.25mm pitch and file bolts if necessary. If the balljoint nut is warped or damaged, replace it. If you cannot find a exact replacement, use a washer and M12 1.25 pitch nut. Replace rear and front side bolts with grade 11 or 10.9 bolts. If you cannot find 85mm and 75mm bolts, get 90 and 80mm bolts and use two good quality washers. Apply copper grease anti seize to the tubing to prevent problems. Do not use Nyloc nuts. They will be extremely tedious and time consuming to remove in the future. Avoid angle grinding or cutting partially threaded bolts to size. This will reduce the minimum thread and compromise the bolt.
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