Replacement wheels

Hi, the photo and drawing I've attached are from a PE del Mar wheel (they do not have stock). I believe this is the same as your 81-279, but your drawing does not include a couple of key measurements. These are indicated on the drawing in red. Can you please confirm your wheel will be a suitable replacement?

If so, two further questions. I actually want this entire assemble in stainless steel. I don't see it listed, but do you have? If not, the next best thing would be to get this item plus a couple of nylon wheels to replace. Does item 81-228 have stainless bearings? If not, then not suitable. In that case I'd like to swap in stainless wheels. Can I just pop in a couple of item 81-241?
If it helps, the PE del Mar model # is A1-323-LS, part number 3728. Thx.
Thx....Randy

Hi thx for the reply. I actually couldn't wait, so I bought all that stuff, just arrived. So now this is the situation.

BTW I assume you meant 81-279, not 249?

The nylon rollers do not have stainless bearings, so they won't be satisfactory. However the stainless wheels don't fit if I use the stainless shafts I purchased (81-307) - the shafts are too big in diameter. I can use the original non-stainless shafts, but that kind of defeats the purpose of using stainless.

So, do you have stainless shafts that will fit in the stainless wheel AND in the wheel assembly? Thx