Any one here who can tell me where I can buy engine mounts for asp 21a?  And will the foam sheet sustain the vibration caused by engine?

Both rcdhamaka.com and lotushobby.com have this

I wouldn't use an IC Engine on a foamie in a hurry

There are videos on YouTube where there are Nitro foamie flying

Sure there are! In fact, a bunch of flyers from Manipur also fly foamies (made from HD Foam they get from cutting up 'Fish Boxes')

But, you asked for sources for mounts, I gave them

I stated ''I wouldn't'' which means you are at liberty to go ahead 

I stated ''in a hurry'' which means I would plan carefully, and put major reinforcement 

That said, I would not put any IC engine on a foamie; period.

Okay but I have used few piece of wood as reinforcement...  And for engine mount to be bolted too, I've used wood glued to thick foam piece thinking it my absorb so vibrations...  Now where can I find a mount?  Any one here who could sell me one?

use 5mm ply wood thats good...

rajflyers.hpage.com