[newell_0]

I'll respond with what Google tells me.

C-10, C-11, C-12, C-13 (Except Acert Model), C-15 (Except Acert Model), C-16, C-18 standard T-205 with nipple T205N
C-13 Acert Model, C-15 Acert Model *Adapter may be required for this engine/vehicle. adapter ADP-205 standard T-205 with nipple T205N

Here's a link to the chart. http://www.fumotousa.com/size-chart.php

John,

Thanks for your reply.  I had visited that site as well. I'm not sure whether I have Acert Model or not. I don't know what Acert Model is, or where to look for to see if have this?