I'm very late to the party. If this is border-line dead thread resurrection, let me know & I'll calibrate for the future.
I refused to pay Sears for their bagger when I bought my LT many years ago. I found plastic trash bins that, when paired together, were a good match for the width of a big storage tote. The length of the tote was about 4" too long, which was just about perfect for the discharge vent. The trash bins hang from a fork-shaped rack behind the LT. The storage bin is bungeed upside down over the tops of the bins, with the discharge vent area on the same side as the discharge from the mowing deck. I used all metal flexible heating duct from Lowe's/Home Depot to make a sweeping bend from the mower discharge to the storage bin. It enters the bin on the front side and quite an angle. Clippings and leaves fill the far side trash bin first, then the near side. The flex duct would last a season or so. The only trick piece was making a proper adapter for the mower deck discharge. I have some from-scratch fiberglass skills I acquired keeping my race car bodies repaired. Use whatever spray foam you like best, shape it and skin it with Bondo, sand it smooth, slather it with floor wax (harder to find these days) and lay-up a fiberglass part. Ignoring my fabrication time (I was unemployed at the time, so my time was of little value), I think I had about $60 invested.
No pics available - we retired and moved to the woods. I scrapped the bagger when we moved. No intention of mowing anything bigger than a little dab of lawn between the house and shop.