Are they?
On my 70, there are 4 plugs which push into the 4 holes on the front panel, the original badge has 4 pips in each corner (yes i know it's a round badge...) these pips have very small notches on them, these then push securing into the plastic clips you fitted earlier, and hold the badge in. Mine is a OG badge, and clips, and is in very tight, I want to remove it to repaint it, but as you know, it is on very tight!
Here are the correct earlybay clips:
http://www.vwheritage.com/vw_spares_Badge-clip-T2-front-68-71-set-of-4-211853615_act_shop.product_pID_161316.htm" onclick="window.open(this.href);return false;
Here are late bay clips:
http://www.justkampers.com/211-853-619-front-badge-clip-3-pack-vw-t2-bay-1973-1979.html" onclick="window.open(this.href);return false;
AFAIK they aren't held on behind the front panel?
Alistair