V8 front lip

[jimblob]

I have just ordered a v8 front lip with the fibre glass bit (old plastic lip looking tired) Whats the best way to attach this? I already have a v8 front lower half of the bumper. the last plastic front lip was held on with self taping nuts is this correct? 

[jimblob]

change of plan sticking with the plastic lip but need to get a new one. I have been told this part is obsolete? is that true if so what do you do if you wanna keep the plastic front lip but needs a replacement.