Hi Asperformance.
You are right, I did the small cover as well. The link was just to show you guys what I used, I purchased my tube from Unipart at £5.50 - £6.00 approx. Had to pay what ever they were asking for as needed it that day, think Camberley Autos were more expensive, but I think they did do a tube that did not have the auto pump action on side that was cheaper, but wanted to go for an easy application.
Good news........
IT WORKED NO LEAKS