Mercury Outboard 20hp 200 1975 Piston 780-9229 40hp 45hp 50hp 500 450 400 18hp and check out the last

and check out the last image that contains the serial number from the tank bracket if you are curious

Length of driveshaft from top of extension housing to end is just under 17" (see pictures)  (I believe this is the "standard" length)

No cracks or welds

Vertical Shaft: 27940

Mercury Outboard 20hp 200 1975 Piston 780-9229 40hp 45hp 50hp 500 450 400 18hp and check out the lastThis is From a 1975 Kiekhaefer Mercury 20Hp 200 2 cylinder 2 Stroke Outboard Item Condition: Good Condition Does not have rod pin Please Inspect Pictures for condition Part#'s Piston: 780 9229 Other Related Models: Mercury 20hp 200 40hp 400, 45hp, 450, 50hp, 500 1974, 1975 1976 1977, 1978 Yours should look like this one. Please ask if you are unsure if this part will work for you. Please send model and serial number. You will receive what is in the