Yeah there were bolts around the bottom edge of the body. The fenders didn't have liners though, and they came and went with the body.
My 61 was aftermarket painted turquoise.
My 63 was factory sort of Martini olive green, with dark green trim. Gray fabric sunroof.
The 61 did not have a gas gauge, the newer one did. On the 61 there was a lever under the dash that could be turned when you ran out of gas, to drain an extra gallon in the tank. Of course once you used it, you never turned it back again. I kept a little pad of paper that I wrote the miles on when I bought gas. 10 gallon tank went 300 miles pretty dependably.
I was in a club with an older guy, ex Wehrmacht. He lived in Southern California and had a girlfriend in Portland or Seattle and drove up there most weekends.
Unbelievable miles on his car, like 400,000. He'd casually say that he got about 100K out of an engine, maybe 200K out of the transaxle and was still on the original suspension. Kept the car in good shape too. Pretty much get on I5, mash the pedal to the floor and go 70 straight through.
The car didn't have a tach, but the shift points were marked around the circle on the speedo, which went up to 80. Don't think I ever got going that fast.