Defining standard fittings in pipe specs & replacing current fittings

[own_operate]

2 issues: 

- how to set new standard fitting for a pipe spec (in this case, grooved class 300)

- how to replace all current fittings with custom fittings 

Here is an example of a 45 that I want to make the "standard" 45 for grooved spec.  Main difference is distance of pipe end separations.  Default grooved class 300 creates a 1/16" gap, which is fine for standard Gruv or Vic fittings, but new SlideLOK fittings have a range of 0-3/32".  The custom fittings I have yield a total separation of 1/16" (or 1/32" for each side). 

Example here:

Here is the system I am trying to replace all fittings in. Is there a way to just blanket replace all current 90 & 45 fittings (keeping orientation) with my own?