Okay ;

I purchased "Doc's" (brand) # DC3030, original # 91175923 .

They too didn't have the heavy plastic / rubber surround and so took a few moments to figure out how to install .




I used the flat end of the tire iron you see here, I gently slid the 1st. one in then kind of bunted it down and into place .

 

You can see what I had to do to vacuum the space in there that had leaves and dust .

 

Here you can see the collected leaves and dust, I had to do this several times before there were none left .

 

This is how I made my tank vacuum's too large hose fit :

I grabbed a section of the largest hose I had that fit into the filter aperture, slid one end of it far into the too large hose and VIOLA ! .

I could easily suck anything out .

 

This is mine:

 

Same same I just saved labor.... =8-) .