Oring Sizes for Cyl Head Coolant Tube

[barber1303]

Does anyone know the specs for the three orings that go on the coolant tube that fits in the middle of the cylinder head? I bought a gasket kit which has a pile of orings, but no identifiers of what goes where. Many of these orings are similar in size, so I want to be sure I get them in the right positions. #s 16, 17, 18 in this clip from the parts fiche.

 

[barber1303]

The oring sizes for this coolant tube are:

16mm ID x 2.5mm CS
18mm ID x 2.5mm CS
21mm ID x 2.5mm CS

The material is silicone. I bought both silicone and Viton, but the viton durometer is higher and required a larger installation force than I was comfortable with to get the tube to seat in its bore.