I found laying around the house some colored rubberized silicone round end caps that fit over snugly over the side cover tabs inside of my I/S. Not sure what they are called or what they were for, guessing bought them either in the automotive or electrical supplies at local store years ago.
something like this but come in bright colors no idea where I got them from but guessing any hardware store will have them maybe just have to get the right size?
https://www.amazon.com/50pcs-Rubber-Finisher-Thread-Protector/dp/B01G9Z5FG8/ref=sr_1_7?s=hi&ie=UTF8&qid=1477447478&sr=1-7&keywords=round+silicone+rubber+end+capsthey are about 1cm wide, if that, and tad bit over 1 cm tall, and rounded top. They fit well and stretch width wise some, and am sure they came in a pack of them and cost a ton less than 1.50 each at the stealership am sure of it.
I tried looking them up at farm and fleet store, but could not locate them but they do come in varied colors.