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Dang I can't find the link from a couple years ago. I think I saw something on Kameari's website about reproducing new castings of the mk63 calipers. They had pics of the rough castings pre machining. I had to translate the japanese obviously. I can't find it on their site now. It was awhile ago though maybe it wasn't Kameari. Parts Assist M Speed has the new units though. I know I wasn't on their site when I saw the post about the castings from a couple years back. These were a factory Z, hako, caliper for vented rotor. I'd run these. Not sure what the "stock" rules mean in his class but the mk63's were the road racing caliper back in the day weren't they? (I don't know too much about the old factory race car setups from back in the day) I've always assumed the mk63's were the homologation brake for one of the lower sports car classes. https://www.rhdjapan.com/parts-assist-m-speed-mk63-4pot-caliper-brake-kit-s30-s31-b110-gc10-kpgc10-pgc10-kgc10-kpc10-pc10-gc110-gc111-gc210-gc211.html *I would ignore the rotor diameter callout in the RHD description. Also, found this on the "other forum" should be some info in here. https://www.classiczcars.com/forums/topic/56999-looking-for-a-set-of-sumitomo-calipers-mk63/ Kameari should have a stock vented disc http://www.kameariengineworks.co.jp/Catalogue-v3/catalogue-075-20160731.pdf

I used the eastwood on my car. It has the consistency of water, so cover under the car when you spray it because it will start coming out of all the holes, seams, cracks, etc.