There is no fixing on the panda which is specialised all are available just knowing. The description i.e. Flange headed bolt , insert nuts
Countersunk Allen cap screw , Poly nuts , nut ,nylock ,cup square squared headed , track bolt ,set screw just use a fixing stockist get the size thread & type i.e. M8 x 25 x 1mm set (threaded all the way M8 x 40x 1.25 mm bolt ( % of thread only various lengths available )
Are these oval ?if so get a stock steel tube , use an engineers press to apply force along the length magically its oval cut to length, repeat To measure required diameter use a bit of maths. Or guess work