What we needed, cheaper than from the manufacturer (actually ...
599206
What we needed, cheaper than from the manufacturer  (actually, the manufacturer wanted us to buy the whole maintenance kit - hundreds of $$).  Takes awhile to receive though because it came from overseas,  if you don't need right away its fine)
3552946
Parts fit, did the job, cost less, high fives all around!
1091063
Less expensive than the "original", but did the job - even better in my opinion.
2744607
Exactly what we needed to replace worn original.
2099886
Again, another product for DIY or lowering replacement costs. I was very pleased to locate this item, it saved me a bundle of money, compared with original part. Work the same and probably better!
2344091
they do the job...much cheaper than other places.
4905392
What we needed without having to scour stores and buy multiple small packs for a higher price
2271315
It worked perfectly, like it came from the manufacturer OEM
1652345
Does exactly what it's supposed to do. What more can I say. A lot less expensive than the manufacturer's part.
3281068
We ended up taping ours on, but it was a much cheaper option that buying new cords, and they work great
205083
No problems with these cartridges and much less expensive than manufacturer's replacement.
4058647
Cheap, reliable, effective...not as easy to install as it should have been.
4876270
Great.  Cheaper than the manufacturer one.  Does the same job at a lower price
677528
what we needed and we got it quick we will buy more
1238497
Guess we really needed to replace the old one, (see pic).  Received the new one in timely manner, it fit and did the trick
593973
Just what I needed and a much cheaper price than some of the competitors.
1271681
Great, inexpensive, and they work.
Yes, like everyone else said, the screws are inside.

I had to shorten one because the spring held the door farther out than I wanted,
 so I cut some of the spring off with side cutters, and popped the rubber cap right back on.