Inline sight glass parts

I found these...http://www.ebay.com/itm/330949531077
I just wanted to know if these were a good price and ok to use as pasrt of my sight glass build....

Was also gonna use this..http://www.ebay.com/itm/141085283314
as the tube itself.... now i just need the bolts/nuts, and the high temp gaskets...

Looks like you'd have $43 wrapped up in just those flanges and glass; with the other pieces, I think you'd exceed the cost of just buying a sight glass. I know that's not a very DIY response but DIY doesn't always make sense either.

Another concern would be what is the diameter of that glass (flange seems small when looking at the bolt placement). Also, how would you seal the glass against the flange?

In comparison: http://www.brewershardware.com/TC10SG.html

Thanks for the info! I have not set up my stand yet and just got my pump yesterday. I was trying to get an idea of what i could do without tri clamps. As far as the seal, thats what the high temp gaskets are for.
i saw this...https://www.homebrewtalk.com/f51/inline-o2-injector-76613/#post1191702
and i got excited....

I just purchased a piece of 3/4" borosilicate (Pyrex) glass tube, inserted it in my pump output hose and
used snap grip clamps to secure it. Under 10$.