That should be for a TR7 [;)]
Unless you have all th egear and materials I wouldn't bother.
You should be able to get a new one for under £ 30 from Robsport.
Not able to go out and measure mine as I managed to injure my knee in the snow yesterday [B)]
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<font color="blue"><i>1980 TR7 DHC (my first car, now restored and back on the road)
1981 TR7 FHC Sprint (better known as 't Kreng)</font id="blue">
<b>[url="http://www.tr7beans.blogspot.com/"]<u><b><font size="2"><font color="red">My Weblog</font id="red"></font id="size2"></b></u>[/url]</b></i></center>