The nozzle inserts that I have from Don at Airflow are brass color and include a diameter marking such as 0.0275". For folks of our generation, a magnifying glass may be required. 
My standard Lycoming nozzle inserts are 0.028" diameter passage and steel (silver color) and NOT marked for diameter.
So, if you know where the custom ones went (from your engine logbook perhaps?), you can identify them and put them back in the right place.
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Bill Pendergrass
ME/AE '82
RV-7A: Flying since April 15, 2012. 850 hrs
YIO-360-M1B, mags, CS, GRT EX and WS H1s & A/P, Navworx
Unpainted, polished....kinda'... Eyeballin' vinyl really hard.
Yeah. The boss got a Silhouette Cameo 4 Xmas 2019.
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I mixed up my fuel injection nozzles
Linear Mode
