I would start my search at Numrich Gun Parts Corp.
I have a CNC Billet Aluminum tube fed trigger guard for a Winchester model 77. I have then polished or hard black anoidzed.
The model number should be stamped on the barrel just above the trigger guard.
The trigger guard is available from Numrich Gun Parts. There are two different types of trigger guards for the Savage 6d. The plastic guard that has a inletted area for the trigger guard in the stock and the simple bent metal trigger guard that just screws into the stock wood. Plastic trigger guard is product # 103530U $24.10 Metal guard is product # 10543OAL $11.50
We have them. email@example.com
It should be on the under side of the receiver in front of the trigger guard and the loading port. it would be a number 7 digit's long, if it's a newer gun it may start with a letter.
Try a Mossberg Model 385K. This is what it was originally
At a good gunsmith's shop. Maybe Numrich's Gun Parts (search gunpartscorp) For the complete trigger guard assembly, including trigger, safety, springs, pins etc., you can get it from Numrich, Midway USA, Brownells or direct from Marlin. If it's just the trigger or other individual trigger guard parts you need, you'll have to get those from Numrich for a different model Marlin.
Model 94 winchester 30 30
Your two best options are to find a gunsmith and find a gunsmith. By the time you buy the necessary book(s) you could have paid a gunsmith to do it.
Gun shops,garage sales,gun shows,E-bay etc.
There were a few that do not have a standard trigger, but use a THUMB trigger. Do a web IMAGE search for Winchester thumb trigger rifle, and you will find it.
By providing a serial number to your Winchester model 53.