Enumerating Pi + SL Collisions

[Hdjensofjfnen]

I'd like to try to enumerate the possible pi and SL collisions in Life. They sometimes yield interesting stuff, like this one by the MIT group (1971):

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x = 8, y = 5, rule = B3/S23
2o$obo$bo3b3o$5bo$5b3o!

And a boat doubler and (9,11) shifter:

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x = 37, y = 7, rule = B3/S23
30b2o$b2o26bobo$obo27bo$bo$5b3o26b3o$5bo28bo$5b3o26b3o!

The ones posted use boats, but this thread isn't limited to them.

EDIT: Would had been pi to pulsar had it not had too little room:

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x = 9, y = 3, rule = B3/S23
2o4b3o$2o4bo$6b3o!