balances, plastic piece keeps window frame together, metal clip on window frame & plastic strip holds glass in place

Thanks for writing in. Do all these channel balances have the same nylon fittings? If so, they are either our Series 351 or Series 390. The only difference between these two balance Series is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement. Compare both with your old hardware to see what matches best; see the diagram below for reference.

Comparison of the S351 and S390 balance shoes.

For the window with two different sized balances, measure the height of visible glass in the window sash. Your balance's length should be 1" longer than that visible height. 

For all these balances you will need to choose stamp options, or what denotes the strength of the balances. Look for stamps on the old balances that indicate what option to choose. If there are none or you are uncertain, weigh your window sashes. You can then match that exact weight with one of the weight ranges listed alongside each stamp option under the production description on every balance's shop page.

For the Top Sash Guide, the 18-052 comes to mind, but review the dimensions below, and let me know if anything differs.

Alternate view of 18-052

Alternate view of 18-052

Finally, it sounds like you're referring to glazing bead. We have a number of possible beads that fit your descriptions. Compare your old bead's specific dimensions to our selection here, and see if anything matches what you need.