I'd think twice about buying a Lee holder and filters for a single lens.
I also think you'll find it no more expensive, and probably less expensive, to purchase 105mm round filters second hand than to invest in a filter holder and square/rectangular filters, and that you'll also find round filters more convenient if they're what you use except in this one instance. The caveat is that you have to go the rectangular route if you want to use graduated neutral density filters.
I would definitely try a 100mm filter holder and filters before I'd go to 150mm. A 150mm holder and filters are going to cost you more, indeed quite a bit more, than buying 105mm filters second hand.
You could also have used a Rodenstock 82mm centre filter with your 90mm lens. The Rodenstock's outside thread is 112mm, which just underscores the fact that you can wind up with an outside filter size that is larger than your lens necessarily needs.
I would not assume that a lens that takes 82mm filters actually requires, when a centre filter is used, 105mm filters to prevent vignetting, and that a 100mm square filter won't work.
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