PRO-TEC rec head 701 o-ring size

[Yamadogggy]

Does anyone know if I need the small or large sized protec o-rings for this rec head? Temp sensor on intake side. I’ve seen posts of people getting the wrong ones and want to avoid getting the wrong ones or buying both sets because their shipping prices are very high. I work on the road a lot and have about 2 weeks off that I want to throw a top end in for this season. Thanks for any help

 

[Dorny119]

I do not know the answer to your question. However can you use calipers to measure the groove and purchase o-rings from mcmaster or even a hardware store maybe?

I see you have a Mach 2 pipe. I am building a 760 with a mach 2 pipe. Interested to see how it is. Never used one before.