I copied this from another forum and it looks like it may be copied from the blur book or another price guide. From this description and and from the frame photo of a parts link i'll add to i don't think yours is the first variation. According to what I'm reading that has a birds head grip and was later changed. There is also some serial number info that may help you. I'm not familiar with the parts in those but to me it seems you're missing more than two parts. Do you have any pins or screws to hold it together?
MODEL 922 DOUBLE ACTION FIRST MODEL LARGE SOLID
FRAME
22 RIMFIRE
CALIBER ------------------------------------------1927-1952
9 shot cylinder capacity, pull pin cylinder release, blue finish, 6 inch octagon barrel, two piece over size walnut grips saw handle shaped, marked with company name and address on top of barrel, right side of barrel H&R 922 and caliber on left side of barrel.
First Variation 1927-1930 serial number
range 115000*-145000*(estimate)
Second Variation 1931 DIFFERENCE: new grip shape (saw handle shape eliminated) serial number
range 145000*-160000*(estimate)
Third Variation 1932-1937 DIFFERENCE: new safety cylinder, serial number
range 160000*-171000*(estimate)
Fourth Variation 1938-1939 DIFFERENCE; new
grip frame and round barrel, serial number range 171000*-192000*(estimate)
Fifth Variation 1940- 1947 DIFFERENCE; same as 4th variation except letter code prefix to serial number A thru H
Sixth Variation 1948-1949 DIFFERENCE; a new barrel length, serial number letter codes I and J
Seventh Variation 1949-1952 DIFFERENCE; all-in-one
cartridge extraction system, serial number letter codes J thru M
Eight Variation 1952 models for M922 Camper and M922 Bantam weight (see post 1953 models)
VALUE: 100%=$195 60%=$55 add 40% premium for 1st Variation and 20% premium for 2nd, 3rd, 4th & 5th Variations
when looking for parts for this
gun tell the supplier it is a pre1940 model. this should have the birds head
grip frame called "RICE FRAME" by collectors and some people even
call it the second model 922.
https://www.schludershots.com/gun-parts-by-model/h-r-gun-parts/h-r-model-922-gun-parts.html