I was looking for some O Rings for the chains on my Bobbins and for the screws on my alarms to ensure they line up properly and can be unscrewed with out locking up. I came across some packs by Silverline and they are a lot cheaper then buying tackle trade branded ones.
I am not recommending this seller and notice he has some bad feedback but I ordered a pack and they come quickly. The quality is not as good as the ones by Solar but a lot cheaper and you are left with plenty of spares. So well worth thinking about getting the Silverline ones if you need them.
http://www.ebay.co.uk/itm/360539105326?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649