For a 49 you will need to specify a series and the exact gasket needed because of the different style lights. If no one on the forum has anything to offer Steel Rubber has reproductions for both the 22nd and 23rd series 49 housing to body rubber cushion pads.
https://www.steelerubber.com/taillight-mounting-pad-30-0266-15https://www.steelerubber.com/taillight-mounting-pad-30-0124-15 Some of the lenses have a foam gasket between the glass lens and metal housing to keep dust and moisture out of the housing. If that is what you are looking for I don't believe it is reproduced so you may need to buy a piece of closed cell foam rubber and cut your own. McMaster-Carr is one vendor who carries the closed cell foam in smaller size sheets of various thickness.
https://www.mcmaster.com/foam-rubber/thickness~1-8/texture~ultra-smooth/cell-type~closed/ 1/8" thick is the most common but in a few of the foams they also have a slightly thinner material which may be closer to the original thickness. Amazon also has a limited selection of similar materials.
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