Must there be a mounting bracket to connect with a rubber buffer?
Hello evw,
Yes, there is a little angulated bracket of flat steel that attaches to you heater/blower unit and to the tunnel.
I.e. it is fixed by a bolt (and nut) through the tunnel and the other end to the blower unit.
The upper part of the bracket is roughly triangular - like the bracket part on your blower unit;
the lower part is rectangular. Roughtly 2 x 1 inch in size. It's a yellow cad sheet metal piece, about 3 mms thick.
Sorry, currently no pic available.
Good luck,
Achim