I when for OEM once. They were about £16 but they have to withstand a lot of heat and probably a different grade of steel compared to most normal bolts.
I have them on mine and will still use them when i go BT as i totally trust them. My mates Supra has been on the dyno with the manifold and studs glowing cherry red.
I get them form a local place just up the road from where i live
They do not do delivery but everyone will have a place like this near to them, take a stud into the shop and they will match it if you tell them there is a lot of heat passing through them.
Pick up the yellow pages and have a look for a place near to yourself's.
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