03s and 03A3s are not common in Canada. If it is still in issue condition, leave it unmolested.
If bubba has had his way with it, and it is beyond restoration, that is a different story.
How low is the scope? I think I have a bolt body from a Midland 2100 (03A3 bolt altered for scope). Might work for you. If you are interested, send a pm, and I will see if I can find it.
It would need to be refinished, and headspace would need to be checked. Having said that, when I made up my 03A4 clone on a bubba'd rifle, a Midland bolt dropped right in with perfect headspace.
Keep in mind that 03A3 receivers are a bit of an adventure to drill and tap.