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Those are 11sp chainrings? If so, made for Ultra-/Powertorque cranks with a differential BCD. You can enlargen the 5th hole with a file until it fits. The FC-RE102 bolt is proprietary, The FC-RE105 spacer is 3.7mm thick. You'll also need a washer between crank and and outer chainring, 0.4mm (FC-RE006) was used with campy 10sp Rings, so you'd probably need something a bit thicker. Getting these as spares is rather spendy, you might or might not get lucky on ebay, I've seen them sold as sets.
I personally would just get a complete chainset in good nick...NOS/Mint 10sp Chorus/Record rings can still be found at OK prices if you steer clear of scalpers.
gertrudestein
@Jw89
I have a Campagnolo Record Crank arm set, vintage silver ones with the 5th bolt in the back of the crank arm. I'm putting Stronglight Ct2 rings on (which for some reason are 135bcd apart from one hole which is slightly different making them not fit quite right. Anyone know why they would do that?) Obviously with the 5th hole being in the back of the crank arm I need a longer bolt and also a spacer to sit between the rings. Is there a standard way of doing this? How would it have been done originally on the Record crankset?