Built a pair of drop-ins for a customer so I took a few shots. Yes... we stock parts even for our 2" coil drivers - I can't stand to see sub motors get thrown away (hang on E8 v.1 guys... working on updated parts for those).

* Top triple joint action - we assemble these ourselves so it's all done with heavy duty CA glue like the Z v.2 and Nightshades.

* Side view. Surround is a little bowed from sitting in it's shipping box, the cone is straight no problem

* Rear triple joint support ring in place like the bigger SA woofers.

* Your SA-8 make a ticking sound at high excursion? Guess what ? It moved about 28mm rearward and your triple joint ring hit the top plate. Needless to say the spider allows alot of travel and it's backed by a really strong motor... so be careful!

Oh yah... drop-ins are $30 + SH... so they are quite affordable.

Highly suggest CA glue under the spider and then a bead of epoxy around it like so :

Tutorial: How to strengthen spider landing glue on SA-8 - SSA Car Audio Forum

These little things do have a high motor force and lots of throw so the spider landing glue takes a beating.