MrYesterday is that some dirt/damage on the markers at 1-2-4-5hrs?
as for the rubber strap, there are no more replica replacement straps, eventually you can find one from another member if posted for sale. The only option is a genuine strap but they are expensive ~250$
recently I found one interesting strap but the price is too high (350$)
ISOFRANE is a good option as well but the price is in the 150$ range. The good thing is that there are some unbranded options of the same strap that are more budget friendly