TTI Exhaust on Early A's

Picked up a set of poly-loc mounts to help keep the motor in the correct location.

My mounts are kinda new, 4-5 years old, but those huge thick rubber isolators start to sag sooner or later.

What is the compressed dimension of a new thick rubber biscuit? I got some and they are pretty squat looking and in designing some headers with scant clearance so I need to find out correct height of New mounts. Or your poly-loc mounts (where do you get those?) Might end up making spacers and running the "grilled cheese" later mounts if I cant get the thick ones to work out.