Need track section from Hot Wheels 6 lane raceway set

I live in the UK and was recently able to obtain a Hot Wheels 6 lane raceway, but it is missing the last bottom track piece (though it does have everything else including finishing gate).   Despite this it is actually still usable, but I would like to find a replacement for the missing track piece if possible.  I have already tried Mattel directly without any success.   

thanks in advance,

Bruce