[Shep]

There are several that can be used,most can't but you should definitely buy them,



http://www.harborfreight.com/382-piece-o-ring-assortment-67554.html





See this thread,



http://cx500forum.com/index.php?/topic/6697-harbor-freight-o-rings/



I've used them inside my engines and on the water coolant transfer pipes(Not the knuckles).



The R13 size is a dead fit for the engine side coolant transfer pipe and you get quite a lot of each number.I'm very very glad I have that box at hand

 

[Shep]

$5 I may have to go buy another set.

At that price and so long as the Postage is OK they are too cheap,"NOT" to buy Don