Nob good genuine rear guards fetch good money , I fitted a set of DC plastics to a 175T and they were not to bad
They are not the best finish but the fit was pretty good , i did mould the side covers with a heat gun a bit, but if you get the set inc headlamp the colour is uniform . Of course they dont match the tank shade very well and i dont have an answer for that
If its a rider then the DC stuff is ideal but for a resto keep a lookout on ebay for genuine .
As far as the shocks go i think the bolt is bigger on one side at the top mount 10mm bolt for the metalastic bush one and 8mm bolt for the Heim joint one . The Heim bearings have reducing collars that go in the bearing first 2 top and 2 bottom .