Does anyone know what size the vacuum caps on the ports on the spacer under a stock Nikki are? (And where to get them online?)

My local part store only sells mix packs with one of each size for like $5. My rat's nest was removed ages ago and my caps are starting to age and crack, I'd rather not spend $30 just to get 6 little rubber plugs!

Jon

 

https://www.mcmaster.com/84735K76
https://www.mcmaster.com/84735K75
https://www.mcmaster.com/92805K11

These are guestimates. The top two are a little harder and the third can do higher temps and is just a guess at 1/8", but the silicone "should" be more flexible with that durometer.
I have my spacer off now and can measure the exact size soon. Plus side is that those come in packs of 25 or 100 for under $10. Downside is that shipping for those might cost the same as the pack.

I'm considering pulling the nipples and epoxying the ports closed on mine. Or go the cap route, both are prone to leaks in their own way. I live in the same state as mcmaster, could get a pack (for less shipping) and send a size up that works. Depends on how much shipping direct up to you would run.

 

https://www.rockauto.com/en/moreinfo.php?pk=9542660

$0.31 each, comes in packs of 5 if I recall correctly. Bought these for some brake bleed nipples (which are equally hard to find locally). They also have their 5% discount that partially covers shipping.

The nipples are 0.194" and these fit on snug. They are decently thick. The shoulder touches each other on the two right most. Don't know anything about the temps these can withstand.

For the high temp silicone ones. For a non boosted application, the 11/64" should do just fine. Could go a step smaller if worried about them sliding off.

https://www.mcmaster.com/92805K12